@article{krings_cabell_2022, title={Distinguishing Saplings of Pines of Piedmont Upland Grassland Systems}, volume={87}, ISSN={["1938-4386"]}, DOI={10.2179/0008-7475.87.2.211}, abstractNote={ABSTRACT The development and assessment of Piedmont upland grassland restoration efforts is hampered in part by continued challenges in identifying immature individuals of three associated pines, Pinus echinata, P. taeda, and P. virginiana, the penultimate of which is thought alien to the system. To help fill this gap, we studied three quantitative and 25 qualitative characters in 174, 2- to 5-year-old saplings in managed stands in Durham County (North Carolina) and 169 herbarium specimens of mature individuals from 94 Piedmont counties from Georgia to Virginia. Although mean short-shoot needle and fascicle sheath lengths differed significantly between lifestage classes of the three species (F8,335=185, p<0.0001 and F8,335=173.5, p<0.0001, respectively), there was substantial range overlap, likely contributing to diagnostic confusion in the field when existing keys are applied. For example, needle length ranges of all lifestage classes of all species overlapped with those of mature P. echinata and 2-year-old P. virginiana. In addition, at the apex of the previous season's growth, 2-year-old saplings of P. echinata and P. virginiana exhibited needles either predominantly or in higher percentages of threes, than the contrasting described preponderance of pairs for mature individuals. Of the 25 qualitative characters evaluated, we found (1) absence of decurrency glaucescence distinguishes 2- to 5-year-old saplings of P. taeda from P. echinata and P. virginiana, and (2) absence of stomatal plugs distinguishes P. virginiana from the others. A diagnostic key to saplings is provided.}, number={2}, journal={CASTANEA}, author={Krings, Alexander and Cabell, Hannah}, year={2022}, month={Dec}, pages={211–223} }
 @article{krings_szakacs_hyland_2022, title={Remnants of the "Grande Savane?" Insights from Soil Organic Matter at Two Sites in the Deep River Triassic Basin of North Carolina}, volume={87}, ISSN={["1938-4386"]}, DOI={10.2179/0008-7475.87.2.244}, abstractNote={ABSTRACT Narrative accounts and floristics suggest a broader historical distribution of Piedmont upland savannas and woodlands with a prairie-affinity flora than today, although dates of emergence, spatiotemporal extent, and historical dynamics remain unclear. To help address the question whether remnant prairie-affinity patches in the state represent at least historical, if not ancient, grasslands, we analyzed stable carbon isotopes from soil organic matter from two well-known localities hosting prairie-affinity heliophytes, both within the boundaries of historically mapped “Grande Savane”. Soil cores for δ13Corg analysis and radiocarbon dating were collected from five sites, hosting different present-day plant communities and spanning three soil orders. Recovered δ13Corg values suggest historical grasslands, likely savanna-type with some fluctuations in cover, were present at both localities essentially continuously over the past 2000 years until the more recent canopy closure over the past century. These findings are consistent with historical narrative accounts, although significant additional sampling is needed to determine its spatiotemporal extent. While the general trend at our localities transitions from open to closed systems, pronounced fluctuations are apparent in all profiles, particularly between 1254–1468 CE. Precipitation does not appear predominantly responsible, but available climatic reconstructions are from an adjacent basin. The timing of the pronounced vegetation class fluctuations is intriguingly coincidental to the timing of Siouan occupancy and intertribal movements, suggesting a need for more vigorous interdisciplinary investigations.}, number={2}, journal={CASTANEA}, author={Krings, Alexander and Szakacs, Alexandria D. and Hyland, Ethan G.}, year={2022}, month={Dec}, pages={244–267} }
 @article{lindelof_krings_2021, title={Scientific Note: Capsule-Seed Allometric Relationships in Ludwigia ravenii (Onagraceae), a Critically Imperiled Wetland-Obligate}, volume={86}, ISSN={["1938-4386"]}, DOI={10.2179/0008-7475.86.2.278}, abstractNote={ABSTRACT Ludwigia ravenii is a critically imperiled tetraploid known historically from Virginia to Florida. There have been no published studies examining the number of seeds produced per capsule to guide researchers and conservationists in planning studies or collection efforts. Such data are important considering current guidelines by the Center for Plant Conservation recommend that no more than 10 percent of a population's seed production be collected in a single season. To fill this void, our objective was to examine and report on capsule-seed allometric relationships in the species. Our study is based on 25 capsules from six plants from the North Carolina Coastal Plain. Though admittedly limited in geographic scope, we focused on these wild plants to avoid destruction of herbarium specimens and as they were already the subject of a broader, permitted inquiry into seed germination. Consistent with prior, range-wide monographic study, measured capsule dimensions were: length 2.87–5.41 mm (mean=3.98, sd=0.64); broader facet width 1.95–3.67 mm (mean=2.94, sd=0.43); narrower facet width 1.88–3.27 mm (mean=2.70, sd=0.39). The mean number of seeds produced per capsule was 304.8 (sd=94.9). The mean number of seeds produced by capsules at least 4 mm long was 361 (sd=65.7), whereas the mean number of seeds produced by capsules less than 4 mm long was 233 (sd=77.8). In the absence of additional data from other populations, we preliminarily recommend that capsule collection efforts focus on capsules at least 4 mm long.}, number={2}, journal={CASTANEA}, author={Lindelof, Kira and Krings, Alexander}, year={2021}, month={Dec}, pages={278–282} }
 @article{krings_jordan_culatta_szakacs_wilson_2020, title={Annual Signature in the Taproots of Echinacea laevigata and E. pallida (Asteraceae, Heliantheae)}, volume={85}, ISSN={["1938-4386"]}, DOI={10.2179/0008-7475.85.1.199}, abstractNote={ABSTRACT The annual signature of the roots of relatively few species of North American herbaceous perennials is known, which is unfortunate, considering the potential contributions an increased understanding of age structure of populations of such species could represent. To help fill this gap, we briefly communicate here results of recent work on Echinacea laevigata and E. pallida (Asteraceae, Heliantheae), both species of conservation concern in the eastern United States. Analysis of cross-sections of individuals of known age of both species revealed an annual signature consistent with that reported for other herbaceous perennials, namely the development of clusters of vessels with conspicuously large diameters, marking annual spring root growth, followed by vessels of reduced diameter in the remainder of the year.}, number={1}, journal={CASTANEA}, author={Krings, Alexander and Jordan, Chad and Culatta, Katherine and Szakacs, Alexandria and Wilson, Greg}, year={2020}, month={May}, pages={199–204} }
 @article{krings_2020, title={Distinguishing Seedlings of Pines of Piedmont Upland Grassland Systems}, volume={85}, ISSN={["1938-4386"]}, DOI={10.2179/0008-7475.85.1.33}, abstractNote={ABSTRACT Despite the ecological and economic importance of pines (Pinus) in the southeastern United States, there exist no taxonomic keys or resources that facilitate the comprehensive identification of pine seedlings. The objectives of this study were to analyze select aspects of seedling morphology for the three primary pines associated with Piedmont upland grassland systems of conservation concern (Pinus echinata, P. taeda, and P. virginiana) and subsequently to develop a resource, traditional or probabilistic, depending on the outcome, to facilitate species-level determination. Two characters—the number of primary needles in the first whorl post-germination and needle apical curvature relative to the stem—were assessed through analysis of 3,200 seedlings under field conditions. The mean number of primary needles in the first whorl was 5.9 (s.d.=0.56) for P. echinata, 7.3 (s.d.= 0.79) for P. taeda, and 5.3 (s.d.=0.63) for P. virginiana. Predominant needle apical curvature was away from the stem in P. echinata (90.5%) and P. virginiana (91.5%), but toward the stem in P. taeda (97.5%). Based on these data, a probabilistic diagnostic framework that takes into consideration both morphology and stand composition is presented, including supplemental appendices of calculated posterior probabilities.}, number={1}, journal={CASTANEA}, author={Krings, Alexander}, year={2020}, month={May}, pages={33–41} }
 @article{haynes_phillips_krings_lynch_ranney_2020, title={Revision of Fothergilla (Hamamelidaceae), including resurrection of F. parvifolia and a new species, F. milleri}, ISSN={["1314-2003"]}, DOI={10.3897/phytokeys.177.49589}, number={144}, journal={PHYTOKEYS}, author={Haynes, Jake E. and Phillips, Whitney D. and Krings, Alexander and Lynch, Nathan P. and Ranney, Thomas G.}, year={2020}, month={Mar}, pages={57–80} }
 @article{haynes_phillips_krings_lynch_ranney_2020, title={Revision of Fothergilla (Hamamelidaceae), including resurrection of F. parvifolia and a new species, F. milleri (vol 144, pg 57, 2020)}, ISSN={["1314-2003"]}, DOI={10.3897/phytokeys.146.53037}, abstractNote={Not applicable}, number={146}, journal={PHYTOKEYS}, author={Haynes, Jake E. and Phillips, Whitney D. and Krings, Alexander and Lynch, Nathan P. and Ranney, Thomas G.}, year={2020}, month={May}, pages={117–118} }
 @article{smith_krings_2018, title={Euphorbia heterophylla (Euphorbiaceae) in South Carolina, North Carolina, and Virginia, U.S.A}, volume={12}, number={1}, journal={Journal of the Botanical Research Institute of Texas}, author={Smith, S. and Krings, A.}, year={2018}, pages={369–372} }
 @article{krings_newton_liles_2017, title={Hydrocotyle bowlesioides (Araliaceae): New to the Flora of North Carolina}, volume={82}, ISSN={0008-7475 1938-4386}, url={http://dx.doi.org/10.2179/16-109}, DOI={10.2179/16-109}, number={1}, journal={Castanea}, publisher={Castanea}, author={Krings, Alexander and Newton, Shannon and Liles, Nelson P., Jr.}, year={2017}, month={Mar}, pages={47–47} }
 @article{touchell_ranney_panthee_gehl_krings_2016, title={Genetic diversity, cytogenetics, and biomass yields among taxa of giant reeds (Arundo species)}, volume={141}, number={3}, journal={Journal of the American Society for Horticultural Science}, author={Touchell, D. H. and Ranney, T. G. and Panthee, D. R. and Gehl, R. J. and Krings, A.}, year={2016}, pages={256–263} }
 @article{krings_howell_braham_2016, title={Guide to the littoral zone vascular flora of Carolina bay lakes (U.S.A.)}, volume={4}, ISSN={1314-2828 1314-2836}, url={http://dx.doi.org/10.3897/BDJ.4.e7964}, DOI={10.3897/BDJ.4.e7964}, abstractNote={Abstract Background Carolina bays are elliptic, directionally aligned basins of disputed origin that occur on the Atlantic Coastal Plain from the Delmarva Peninsula to southern Georgia. In southeastern North Carolina, several large, natural, lacustrine systems (i.e., Carolina bay lakes) exist within the geomorphological features known as Carolina bays. Within the current distribution of Carolina bays, Bladen and Columbus counties (North Carolina) contain the only known examples of Carolina bay lakes. The Carolina bay lakes can be split into two major divisions, the “Bladen Lakes Group” which is characterized as being relatively unproductive (dystrophic – oligotrophic), and Lake Waccamaw, which stands alone in Columbus County and is known for its high productivity and species richness. Although there have been several studies conducted on these unique lentic systems, none have documented the flora comprehensively. New information Over the 2013−2014 growing seasons, the littoral zone flora of Carolina bay lakes was surveyed and vouchered. Literature reviews and herbarium crawls complemented this fieldwork to produce an inventory of the vascular plant species. This survey detected 205 taxa (species/subspecies and varieties) in 136 genera and 80 vascular plant families. Thirty-one species (15.2%) are of conservation concern. Lake Waccamaw exhibited the highest species richness with 145 catalogued taxa and 26 species of conservation concern. Across all sites, the Cyperaceae (25 spp.), Poaceae (21 spp.), Asteraceae (13 spp.), Ericaceae (8 spp.), Juncaceae (8 spp.), and Lentibulariaceae (6 spp.) were the six most species-rich vascular plant families encountered. A guide to the littoral zone flora of Carolina bay lakes is presented herein, including dichotomous keys, species accounts (including abundance, habitat, phenology, and exsiccatae), as well as images of living species and vouchered specimens.}, journal={Biodiversity Data Journal}, publisher={Pensoft Publishers}, author={Krings, Alexander and Howell, Nathan and Braham, Richard}, year={2016}, month={Apr}, pages={e7964–1} }
 @book{clark_krings_stucky_kleiss_2016, place={Fort Worth, Texas}, series={Botanical Miscellany Series 45}, title={Guide to the vascular flora of Kitty Hawk Woods (Dare County, North Carolina, U.S.A.)}, publisher={Botanical Research Institute of Texas Press}, author={Clark, R.K. and Krings, A. and Stucky, J.M. and Kleiss, H.J.}, year={2016}, collection={Botanical Miscellany Series 45} }
 @article{krings_morillo_2015, title={A New Species in the Matelea palustris Complex (Apocynaceae, Asclepiadeae) and a Synopsis of the Complex in the Guianas and Northern Brazil}, volume={40}, ISSN={["1548-2324"]}, DOI={10.1600/036364415x686521}, abstractNote={Abstract— 
 A new, non-climbing species from the Guiana Shield is described and illustrated: Matelea graciliflora (Apocynaceae, Asclepiadeae, Gonolobinae). The new species is morphologically similar to M. herbacea and M. palustris (together the only other erect species of Gonolobinae in the Guianas), but can be differentiated by a number of characters, including perianth and corona dimensions and corolla color. A synopsis of the erect members of the Matelea palustris complex in the Guianas and northern Brazil is provided.}, number={1}, journal={SYSTEMATIC BOTANY}, author={Krings, Alexander and Morillo, Gilberto}, year={2015}, month={Feb}, pages={214–219} }
 @book{hines_krings_stucky_2015, place={Ft. Worth, Texas}, series={Botanical Miscellany Series 43}, title={Guide to the vascular flora of Howell Woods (Johnston County, North Carolina, U.S.A.)}, publisher={Botanical Research Institute of Texas Press}, author={Hines, K.M. and Krings, A. and Stucky, J.M.}, year={2015}, collection={Botanical Miscellany Series 43} }
 @article{morillo_krings_2014, title={A new species and a new combination in Phaeostemma (Apocynaceae, Asclepiadoideae, Gonolobinae)}, volume={33}, ISSN={["1314-2003"]}, DOI={10.3897/phytokeys.33.6453}, abstractNote={Abstract Phaeostemma surinamensis Morillo & Krings, sp. nov., anew species of Apocynaceae (Asclepiadoideae, Gonolobinae) is described and illustrated, and the new combination Phaeostemma fucata (Woodson) Morillo & Krings, comb. nov., is made. The new species, known only from a lowland wet forest of Suriname, seems to be closely related to Phaeostemma fucata, which is an endemic to Ptari-tepui, a sandstone mountain in the southeastern edge of the Venezuelan Guayana.}, journal={PHYTOKEYS}, author={Morillo, Gilberto and Krings, Alexander}, year={2014}, pages={41–50} }
 @article{unks_shear_krings_braham_2014, title={Environmental Controls of Reproduction and Early Growth of Lindera melissifolia (Lauraceae)}, volume={79}, ISSN={["1938-4386"]}, DOI={10.2179/14-034}, abstractNote={ABSTRACT Lindera melissifolia is a federally endangered endemic shrub of the southeastern United States. Numerous populations are gender-biased. The goal of this study was to determine environmental conditions most appropriate for establishment and growth of seedlings and adult females. Seedlings were grown under varied moisture and light to compare growth rates and morphological ratios. Seedlings were clipped to simulate two levels of disturbance, and their shoot sprouting ability was assessed. Densities of adult flowering stems, co-occurring species, and solar transmittance were analyzed within two North Carolina populations. The lowest levels of light resulted in decreased growth, but light and moisture did not interact to affect seedling growth rate significantly. Morphological ratios and growth responses followed patterns expected for plants exhibiting plasticity in response to varied light levels, but not to moisture. Clipping immature plants below root collars decreased survivorship to 31%. Growth rates of new shoots when clipped below and above the root collar were 40% and 58% percent lower, respectively (p < 0.001). Percent cover of Lindera melissifolia explained 52% of the variation in the number of male flowering stems per plot and 14% of the variation in female stems per plot. No relation of stem density to percent transmittance was found. Indicator species analysis revealed association of males with facultative wetland species and a weak association of females with wetland obligates, but overall difference in vegetation composition between plots with or without females present was slight (MRPP: A = 0.02, p = 0.016). We concluded hydrology should be a primary concern for future studies.}, number={4}, journal={CASTANEA}, author={Unks, Ryan R. and Shear, Theodore H. and Krings, Alexander and Braham, Richard R.}, year={2014}, month={Dec}, pages={266–277} }
 @article{thornhill_krings_lindbo_stucky_2014, title={Guide to the Vascular Flora of the Savannas and Flatwoods of Shaken Creek Preserve and Vicinity (Pender & Onslow Counties, North Carolina, U.S.A.)}, volume={2}, ISSN={1314-2828 1314-2836}, url={http://dx.doi.org/10.3897/BDJ.2.e1099}, DOI={10.3897/BDJ.2.e1099}, abstractNote={Abstract Shaken Creek Preserve (“SCP”) is a 2,448 ha (6,050 ac) natural area in Pender and Onslow Counties, North Carolina (U.S.A). Best known for its high-quality longleaf pine savanna habitat, the site contains seven savanna or savanna-like plant community types (i.e., flatwoods or sandhills), three of which are globally critically imperiled (G1): Sandy Pine Savanna (Rush Featherling subtype), Wet Loamy Pine Savanna, and Very Wet Loamy Pine Savanna. SCP hosts three Federally Endangered plant species and six Federal Species of Concern. Formerly a private hunting club, the site was virtually unknown to scientists until the 1990s; consequently, few biological inventories of SCP have been conducted. In particular, no systematic floristic inventories of the species-rich savannas have been undertaken, despite the fact that floristic data is critical to the effective management of any natural area. The goals of this study were to (1) inventory the vascular flora of the savannas, flatwoods, and sandhill community types on site through the collection of voucher specimens; (2) provide a comprehensive checklist of the flora based on collections and reports made from the site and from the same or similar habitats in the vicinity (i.e., within 2 miles of SCP); and (3) create an illustrated guide based on the checklist. In order to increase the usefulness of the guide, taxa not currently known from SCP but collected or reported from the same or similar habitats within two miles of SCP, are included in the guide. Eighty-three families containing 450 taxa, including thirty-two Significantly Rare and thirty-eight Watch List taxa, were collected or reported from SCP; an additional seven families containing a total of 102 taxa, including eighteen Significantly Rare and seven Watch List taxa, were collected or reported from the vicinity. In total, ninety families containing 552 taxa, including fifty Significantly Rare and forty-five Watch List taxa, are treated in the guide. Dichotomous keys are provided to all vouchered or reported families, genera, and species. The following features are provided for all species and infraspecific taxa: flowering and fruiting phenology; synonymy with Manual of the Vascular Flora of the Carolinas, the Flora of North America, and Flora of the Southern and Mid-Atlantic States; relevant voucher information; and, for most taxa, line drawings and/or photographs. For taxa collected from SCP, community types in which the taxa occur and estimates of abundance on site are also provided.}, journal={Biodiversity Data Journal}, publisher={Pensoft Publishers}, author={Thornhill, Robert and Krings, Alexander and Lindbo, David and Stucky, Jon}, year={2014}, month={May}, pages={e1099} }
 @article{porter_deperno_krings_krachey_braham_2014, title={Vegetative Impact of Feral Horses, Feral Pigs, and White-tailed Deer on the Currituck National Wildlife Refuge, North Carolina}, volume={79}, ISSN={["1938-4386"]}, DOI={10.2179/13-037}, abstractNote={ABSTRACT  The Currituck National Wildlife Refuge (CNWR) in North Carolina is inhabited by feral horses (Equus caballus), feral pigs (Sus scrofa), and white-tailed deer (Odocoileus virginianus). The impact of these species on the vegetation of CNWR is unknown. To assess impact, we created two replicate exclosure plots within maritime forests, brackish marshes, and maritime grasslands. An electric fence divided each habitat into two sections: including or excluding horses. On each side of the electric fence within each habitat, we sampled three different 5 × 5 m plots (i.e., 36 plots). The first was a fenced exclosure 3 m high, the second a fenced exclosure raised 1 m above the ground and extended to 3 m, and the third, a control, was not fenced. Within plots, we created two 1 m transects, and randomly selected and tagged grasses, forbs, shrubs, and trees. We measured the distances from base to tip of herbs and from branching point to terminal bud in shrubs. We used a linear model to analyze plant growth rate. We used a length ratio adjusted by the number of days as the response variable. Out of 1,105 tagged plants, we detected 87 disturbances; 80 where horses were present and 7 where horses were excluded. Overall, horses were responsible for 84% of disturbances. Most disturbances occurred in brackish marshes on Schoenoplectus pungens. We detected a significant effect of exclosure treatment on plant growth rate where horses were present (p = 0.035), but not where they were excluded (p = 0.32).}, number={1}, journal={CASTANEA}, author={Porter, Kimberly M. and DePerno, Christopher S. and Krings, Alexander and Krachey, Matthew and Braham, Richard}, year={2014}, month={Mar}, pages={8–17} }
 @article{krings_axelrod_2013, title={Gonolobus aloiensis (Apocynaceae, Asclepiadoideae), a New Species from St. Eustatius}, volume={38}, ISSN={["1548-2324"]}, DOI={10.1600/036364413x674904}, abstractNote={Abstract 
 A new species from St. Eustatius, Gonolobus aloiensis (Apocynaceae, Asclepiadoideae, Gonolobinae), is described and illustrated. This new species is endemic to St. Eustatius (northern Leeward Islands) and represents the first record of the genus for the island. It exhibits morphological similarity to continental G. albomarginatus, but can be distinguished in part by abaxial leaf surfaces glabrous, calyx and corolla lobes shorter and narrower, and abaxial corolla lobes completely lacking glandular indumentum and with eglandular indumentum restricted at most to only the top two-thirds of the lobes. An amplified key to species of Gonolobus s. s. in the West Indies is provided.}, number={4}, journal={SYSTEMATIC BOTANY}, author={Krings, Alexander and Axelrod, Franklin S.}, year={2013}, pages={1132–1137} }
 @article{krings_morillo_2013, title={Gonolobus murphyae (Apocynaceae), A New Species from Montane Colombia}, volume={38}, ISSN={["1548-2324"]}, DOI={10.1600/036364413x674931}, abstractNote={Abstract 
 A new species from montane Colombia is described and illustrated: Gonolobus murphyae (Apocynaceae, Asclepiadoideae, Gonolobinae). The new species is morphologically similar to G. antioquensis (both exhibit caudate corolla lobes), but can be differentiated by a number of characters including vegetative pubescence, calyx pubescence, flower size, and shape of the laminar dorsal anther appendages.}, number={4}, journal={SYSTEMATIC BOTANY}, author={Krings, Alexander and Morillo, Gilberto}, year={2013}, pages={1138–1141} }
 @article{thornhill_krings_2012, title={Discovery of Hydrocotyle bowlesioides (Araliaceae) in Louisiana}, volume={6}, number={1}, journal={Journal of the Botanical Research Institute of Texas}, author={Thornhill, R.W. and Krings, A.}, year={2012}, pages={283–285} }
 @article{krings_2012, title={Matelea gilbertoana (Apocynaceae), a New Species from Venezuela}, volume={37}, ISSN={["1548-2324"]}, DOI={10.1600/036364412x656473}, abstractNote={Abstract 
 A new species from Venezuela, Matelea gilbertoana (Apocynaceae, Asclepiadoideae, Gonolobinae), is described and illustrated. The species has affinities to the ocellate complex in Matelea s. 1., but is easily distinguished by its involute corolla lobes. A key to identify the continental species of the ocellate complex is provided.}, number={4}, journal={SYSTEMATIC BOTANY}, author={Krings, Alexander}, year={2012}, pages={989–991} }
 @article{krings_morillo_2012, title={Matelea sanojana (Apocynaceae, Asclepiadoideae), a new species in the Matelea squiresii complex from Venezuela}, volume={37}, DOI={10.1600/036364412x656572}, abstractNote={Abstract 
 A new species from Venezuela, Matelea sanojana (Apocynaceae, Asclepiadoideae, Gonolobinae), is described and illustrated. The species has affinities to the M. squiresii complex in Matelea s. l., but is easily distinguished by its lanceolate leaves and densely pubescentringed gynostegium. The new species is currently only known from Município Caroni, Estado Bolivar. A key and illustrations to identify the pubescent-flowered members of the complex are provided.}, number={4}, journal={Systematic Botany}, author={Krings, A. and Morillo, G.}, year={2012}, pages={992–994} }
 @article{krings_morillo_2012, title={Two new species in the Matelea stenopetala complex (Apocynaceae, Asclepiadoideae) from the Guiana Shield and Amazonian Brazil}, volume={17}, ISSN={1314-2003 1314-2011}, url={http://dx.doi.org/10.3897/phytokeys.17.3485}, DOI={10.3897/phytokeys.17.3485}, abstractNote={Abstract Two new species in the Matelea stenopetala complex (Apocynaceae, Asclepiadoideae) are described from the Guiana Shield and Amazonian Brazil: Matelea brevistipitata Krings & Morillo, sp. nov. and Matelea trichopedicellataKrings & Morillo, sp. nov. The new species belong to a small group of adaxially-pubescent-flowered taxa within the complex, including Matelea hildegardiana and Matelea pakaraimensis. The new species are described and a dichotomous key is provided.}, number={0}, journal={PhytoKeys}, publisher={Pensoft Publishers}, author={Krings, Alexander and Morillo, Gilberto}, year={2012}, month={Sep}, pages={27–39} }
 @article{krings_2011, title={Matelea pakaraimensis (Apocynaceae, Asclepiadoideae), a new species in the Matelea stenopetala complex from Guyana}, volume={5}, number={1}, journal={Journal of the Botanical Research Institute of Texas}, publisher={The Botanical Research Institute of Texas, Inc.}, author={Krings, A.}, year={2011}, pages={101–104} }
 @article{krings_2011, title={Matelea s. l. (Apocynaceae, Asclepiadoideae) in the West Indies}, volume={36}, DOI={10.1600/036364411x583691}, abstractNote={Abstract 
 The last treatment of Gonolobinae (Apocynaceae, Asclepiadoideae) in the West Indies is over a hundred years old and a number of new species have been described since. Although Fischeria and Gonolobus s. s. were revised recently, a complementary, comprehensive, recent regional treatment of Matelea s. l. is lacking. Considering the rarity of taxa of Matelea s. l. in the West Indies, thirty-three of thirty-six taxa are endemic to a single island each, and that nearly half of the known species have been described since Schlechter's treatment of 1899, the objective of the present study is to provide a synopsis of the genus in the area to facilitate field recognition and future collections. The treatment is based on critical study of ca. 250 specimens of the fifty-some known species in Caribbean Gonolobinae, fieldwork in the region, and molecular analyses. In addition to a comprehensive key and descriptions, illustrations of the complex gynostegial coronas are provided here for the first time for numerous taxa. A new combination is made in Matelea for Gonolobus haitiensis: Matelea haitiensis.}, number={3}, journal={Systematic Botany}, author={Krings, A.}, year={2011}, pages={730–756} }
 @article{post_ali_krings_xiang_sosinski_neal_2011, title={On the Identity of the Weedy Bittercresses (Cardamine: Brassicaceae) in United States Nurseries: Evidence from Molecules and Morphology}, volume={59}, ISSN={["1550-2759"]}, DOI={10.1614/ws-d-10-00063.1}, abstractNote={Bittercress (Brassicaceae) is one of the most prolific and costly weeds of the container nursery industry. Bittercress accessions from container nurseries throughout the major production zones in the United States were examined and compared with herbarium specimens. The identity of these weedy bittercress species were further explored using sequences of the nuclear ribosomal DNA (nrDNA) internal transcribed spacer (ITS) region and the nrDNA region for the COP1-interacting protein 7 (CIP7). Four species of bittercress were detected in the nursery industry of the United States, including New Zealand bittercress, hairy bittercress, flexuous bittercress, and little bittercress. The taxon referred to here as Cardamine flexuosa With. (flexuous bittercress) likely contains two genotypes previously reported as European C. flexuosa and Asian C. flexuosa. Phylogenetic relationships between the four species we examined, particularly in relationship to flexuous bittercress, were not fully resolved by the molecular evidence generated for this study. New Zealand bittercress is nonnative and does not appear in current keys to the species for the United States. Flexuous bittercress is also an alien species, which appears in some U.S. keys but not in all. To aid nurserymen and botanists in identification of these four closely related bittercress species, a key was developed and is accompanied by detailed descriptions and illustrations.}, number={1}, journal={WEED SCIENCE}, author={Post, Angela R. and Ali, Regina and Krings, Alexander and Xiang, Jenny and Sosinski, Brian R. and Neal, Joseph C.}, year={2011}, pages={123–135} }
 @article{krings_2011, title={Pistacia chinensis (Anacardiaceae) naturalized in North Carolina, U.S.A}, volume={5}, number={2}, journal={Journal of the Botanical Research Institute of Texas}, author={Krings, A.}, year={2011}, pages={867–869} }
 @article{krings_2011, title={Synopsis of Matelea s.l. (Apocynaceae, Asclepiadoideae) in Trinidad, Tobago, and the ABC Islands}, volume={5}, number={2}, journal={Journal of the Botanical Research Institute of Texas}, author={Krings, A.}, year={2011}, pages={475–483} }
 @book{krings_2010, place={New York}, series={Memoirs of the New York Botanical Garden}, title={Manual of the vascular flora of Nags Head Woods, Outer Banks, North Carolina}, publisher={New York Botanical Garden Press}, author={Krings, A.}, year={2010}, collection={Memoirs of the New York Botanical Garden} }
 @article{krings_2009, title={A New Species in the Ibatia Species Complex in Matelea s. l. (Apocynaceae: Asclepiadoideae: Asclepiadeae) from Colombia}, volume={34}, ISSN={["0363-6445"]}, DOI={10.1600/036364409788606280}, abstractNote={A new species of Matelea s.l. (Apocynaceae: Asclepiadoideae, Asclepiadeae, Gonolobinae) is described from coastal Colombia: Matelea dugandii. The species belongs to the Ibatia species complex in Matelea s.l., but exhibits distinct differences in floral
 characters from previously known taxa, particularly in the terminal style-head appendage. An updated key to members of the complex in northern South America and the West Indies is provided, including M. cumanensis, M. fontana, M. maritima, M. pacifica, and M.
 rubra.}, number={2}, journal={SYSTEMATIC BOTANY}, author={Krings, Alexander}, year={2009}, pages={429–433} }
 @article{fisk_krings_2009, title={Clarification of the typification of Michaux names in eastern North American Vitis (Vitaceae)}, volume={3}, number={2}, journal={Journal of the Botanical Research Institute of Texas}, publisher={The Botanical Research Institute of Texas, Inc.}, author={Fisk, C. and Krings, A.}, year={2009}, pages={739–740} }
 @article{post_krings_wall_neal_2009, title={Introduced lesser celandine (Ranunculus ficaria, Ranunculaceae) and its putative subspecies in the United States: A morphometric analysis}, volume={3}, number={1}, journal={Journal of the Botanical Research Institute of Texas}, publisher={The Botanical Research Institute of Texas, Inc.}, author={Post, A.R. and Krings, A. and Wall, W.A. and Neal, J.C.}, year={2009}, pages={193–209} }
 @article{post_krings_xiang_sosinski_neal_2009, title={Lectotypification of Cardamine flexuosa (Brassicaceae)}, volume={3}, number={1}, journal={Journal of the Botanical Research Institute of Texas}, publisher={The Botanical Research Institute of Texas, Inc.}, author={Post, A.R. and Krings, A. and Xiang, Q.-Y. and Sosinski, B.R. and Neal, J.C.}, year={2009}, pages={227–230} }
 @article{post_neal_krings_sosinski_xiang_2009, title={New Zealand Bittercress (Cardamine corymbosa; Brassicaceae): New to the United States}, volume={23}, ISSN={["1550-2740"]}, DOI={10.1614/WT-09-017.1}, abstractNote={New Zealand bittercress is reported as new to the United States. While collecting specimens to determine what Cardamine species occur in the nursery trade, New Zealand bittercress was discovered in a container nursery in Wilkes County, North Carolina. The nursery tracked the shipment of contaminated plants to a wholesale nursery in Washington County, Oregon. It was subsequently confirmed that New Zealand bittercress also occurs in a nursery in Clackamas County, Oregon, and has likely been distributed throughout the United States as a contaminant in container grown ornamental plants. Thus far there have been no reports of naturalized populations outside of container nursery crop production facilities.}, number={4}, journal={WEED TECHNOLOGY}, author={Post, A. R. and Neal, J. C. and Krings, A. and Sosinski, B. R. and Xiang, Q.}, year={2009}, pages={604–607} }
 @article{krings_2009, title={Synopsis of Gonolobus s.s. (Apocynaceae, Asclepiadoideae) in Trinidad and Tobago}, volume={3}, journal={Journal of the Botanical Research Institute of Texas}, publisher={The Botanical Research Institute of Texas, Inc.}, author={Krings, A.}, year={2009}, pages={77–83} }
 @article{krings_2008, title={Index of names and types in West Indian Gonolobinae (Apocynaceae, Asclepiadoideae), including fourteen new lectotypifications, one neotypification, and a new combination}, volume={2}, number={1}, journal={Journal of the Botanical Research Institute of Texas}, publisher={The Botanical Research Institute of Texas, Inc.}, author={Krings, A.}, year={2008}, pages={139–163} }
 @article{krings_thomas_xiang_2008, title={On the Generic Circumscription of Gonolobus (Apocynaceae, Asclepiadoideae): Evidence from Molecules and Morphology}, volume={33}, ISSN={03636445, 15482324}, url={http://openurl.ingenta.com/content/xref?genre=article&issn=0363-6445&volume=33&issue=2&spage=403}, DOI={10.1600/036364408784571527}, abstractNote={Abstract Gonolobus (Apocynaceae, Asclepiadoideae) is a New World genus comprising an estimated 100–150 species. Variation in estimated species numbers is largely the result of still poorly known tropical taxa and differences regarding generic limits. Characters historically used to delimit genera such as Gonolobus within Gonolobinae—such as laminar dorsal anther appendages and various follicle morphologies—have been controversial and their evolution remains unknown, not having been explored in a phylogenetic framework. The primary objectives of the current study were to (1) test the monophyly of Gonolobus sensu Woodson in the context of a phylogeny of New World Asclepiadeae and (2) explore the evolution of laminar dorsal anther appendages and winged follicles with respect to their potential utility in generic circumscription. Chloroplast (trnL–F, rpsl6) data are newly presented for sixty-three taxa of Gonolobinae, representing an increased sampling of the subtribe from a maximum of seven taxa in prior studies. These data were combined with a previously published dataset to form a 183 taxa matrix of New World Asclepiadeae. Nuclear (LEAFY) data were newly generated for forty-nine taxa of Gonolobinae. Evidence from parsimony and Bayesian analyses of chloroplast and nuclear data presented here supports the monophyly of both the subtribe and the genus Gonolobus in a narrow or broad sense. Laminar dorsal anther appendages are restricted to Gonolobus s.l. or s.s., although parsimony remains equivocal on whether they evolved once or twice. A transversion in the trnL–F spacer is shown synapomorphic for Gonolobus s.s. Two indels in LEAFY, as well as winged follicles, are shown synapomorphic for Gonolobus s.l.}, number={2}, journal={Systematic Botany}, author={Krings, Alexander and Thomas, David T. and Xiang, Qiu-Yun}, year={2008}, month={Apr}, pages={403–415} }
 @article{krings_2008, title={Revision of Gonolobus s.s. (Apocynaceae, Asclepiadoideae) in the West Indies}, volume={2}, number={1}, journal={Journal of the Botanical Research Institute of Texas}, publisher={The Botanical Research Institute of Texas, Inc.}, author={Krings, A.}, year={2008}, pages={95–138} }
 @article{krings_2008, title={Synopsis of Gonolobus S. L. (Apocynaceae, Asclepiadoideae) in the United States and its Territories, Including Lectotypification of Lachnostoma Arizonicum}, volume={13}, ISSN={1043-4534}, url={http://dx.doi.org/10.3100/1043-4534-13.2.209}, DOI={10.3100/1043-4534-13.2.209}, abstractNote={ABSTRACT Recent evidence supports the recognition of Gonolobus (Apocynaceae, Asclepiadoideae), a genus of 100–150 species of vines endemic to the NewWorld, as distinct from Matelea. Synapomorphies of Gonolobus s.l. include two indels in LEAFY, as well as winged follicles. Laminar dorsal anther appendages are exclusive to the Gonolobus s.l. clade, though lacking or reduced in some species. Given this evidence and in light of past controversies regarding circumscription, this study presents a synopsis of the three species of Gonolobus recognized in the United States and its territories: G. arizonicus, G. stephanotrichus, and G. suberosus. Lachnostoma arizonicum is lectotypified.}, number={2}, journal={Harvard Papers in Botany}, publisher={Harvard University Botany Libraries}, author={Krings, Alexander}, year={2008}, month={Dec}, pages={209–218} }
 @article{krings_2007, title={Novelties in Gonolobus (Apocynaceae : Asclepiadoideae) from the lesser antilles}, volume={32}, ISSN={["1548-2324"]}, DOI={10.1600/036364407780360247}, abstractNote={Abstract Five new species of Gonolobus (Apocynaceae: Asclepiadoideae) are described from the Lesser Antilles: G. absalonensis, G. dussii, G. iyanolensis, G. waitukubuliensis, and G. youroumaynensis. The species exhibit distinct differences in floral characters, including the structure of corolline and gynostegial coronas. Gonolobus martinicensis is lectotypified. A key to Gonolobus in the Lesser Antilles is provided.}, number={1}, journal={SYSTEMATIC BOTANY}, author={Krings, Alexander}, year={2007}, pages={180–194} }
 @article{krings_saville_2007, title={Two new species and three lectotypifications in the Ibatia-Matelea complex (Apocynaceae : Asclepiadoideae) from northern South America}, volume={32}, ISSN={["1548-2324"]}, DOI={10.1600/036364407783390809}, number={4}, journal={SYSTEMATIC BOTANY}, author={Krings, Alexander and Saville, Amanda C.}, year={2007}, pages={862–871} }
 @article{krings_richardson_2006, title={Cayratia japonica (Vitaceae) new to North Carolina and an updated key to the genera of Vitaceae in the Carolinas}, volume={22}, number={1}, journal={Sida}, publisher={The Botanical Research Institute of Texas, Inc.}, author={Krings, A. and Richardson, R.J.}, year={2006}, pages={813–815} }
 @article{krings_2006, title={Distribution and phenology of Gonolobus suberosus (Apocynaceae, Asclepiadoideae) and its varieties in North America}, volume={5}, journal={Vulpia}, author={Krings, A.}, year={2006}, pages={24–40} }
 @article{krings_2006, title={Four novelties and a lectotypification in Matelea (Apocynaceae, Asclepiadoideae) from Hispaniola}, volume={22}, number={2}, journal={Sida}, publisher={The Botanical Research Institute of Texas, Inc.}, author={Krings, A.}, year={2006}, pages={941–953} }
 @article{krings_fantz_2006, title={Notes on types in Apocynaceae – Asclepiadoideae in Cuban herbaria and four lectotypifications in West Indian Gonolobinae}, volume={22}, number={1}, journal={Sida}, publisher={The Botanical Research Institute of Texas, Inc.}, author={Krings, A. and Fantz, P.R.}, year={2006}, pages={533–537} }
 @article{krings_2005, title={A new combination in Matelea (Apocynaceae - Asclepiadoideae) for an endemic Jamaican vine}, volume={21}, journal={SIDA, Contributions To Botany}, author={Krings, A.}, year={2005}, pages={1515–1517} }
 @article{krings_2005, title={A new species of Matelea (Apocynaceae - Asclepiadoideae) from Hispaniola}, volume={21}, journal={SIDA, Contributions To Botany}, author={Krings, A.}, year={2005}, pages={1519–1523} }
 @article{krings_harris_inman_lee_richardson_2005, title={An annotated catalogue of the Bertram Whittier Wells Big Savannah (Pender Co., North Carolina) collections in the North Carolina State University Herbarium}, volume={4}, journal={Vulpia}, author={Krings, A. and Harris, A. J. and Inman, F. M. and Lee, E. and Richardson, A. R.}, year={2005}, pages={52–67} }
 @book{krings_2005, title={Guide to tendrillate climbers of Costa Rican mountains}, ISBN={0813807581}, publisher={Ames, Iowa: Blackwell Pub. Professional}, author={Krings, A.}, year={2005} }
 @article{krings_2005, title={Lectotypification and a new combination in Matelea (Apocynaceae - Asclepiadoideae) for an endemic Hispaniolan vine}, volume={21}, journal={SIDA, Contributions To Botany}, author={Krings, A.}, year={2005}, pages={2081–2085} }
 @article{krings_areces berazain_lazcano lara_2005, title={New and rediscovered milkweeds from Cuba: Calotropis gigantea and Gonolobus stephanotrichus (Apocynaceae - Asclepiadoideae)}, volume={35}, DOI={10.3372/wi.35.35213}, abstractNote={Abstract Krings, A., Areces Berazaín, F. & Lazcano Lara, J. C.: New and rediscovered milkweeds from Cuba: Calotropis gigantea and Gonolobus stephanotrichus (Apocynaceae: Asclepiadoideae). — Willdenowia 35: 315–318. — ISSN 0511-9618; © 2005 BGBM Berlin-Dahlem. doi:10.3372/wi.35.35213 (available via http://dx.doi.org/) Calotropis gigantea is reported new to Cuba and Gonolobus stephanotrichus is reported rediscovered after previously being known only from syntypes collected in 1860-64. Specimens are cited and keys to Cuban species of both genera are provided.}, number={2}, journal={Willdenowia}, author={Krings, A. and Areces Berazain, F. and Lazcano Lara, J. C.}, year={2005}, pages={315–318} }
 @article{krings_2005, title={Notes on the Matelea bayatensis-correllii-tigrina complex (Apocynaceae - Asclepiadoideae - Gonolobinae) in the Greater Antilles and Bahamas}, volume={21}, journal={SIDA, Contributions To Botany}, author={Krings, A.}, year={2005}, pages={1525–1533} }
 @article{krings_weakley_neal_swab_2005, title={Ranunculus ficaria (Ranunculaceae) new to North Carolina and an updated key to Carolina congeners}, volume={21}, journal={SIDA, Contributions To Botany}, author={Krings, A. and Weakley, A. S. and Neal, J. C. and Swab, E. C.}, year={2005}, pages={2429–2437} }
 @article{krings_xiang_2005, title={Taxonomy of the Gonolobus complex (Apocynaceae - Asclepiadoideae) in the southeastern US: ISSR evidence and parsimony analysis}, volume={10}, DOI={10.3100/1043-4534(2005)10[147:totgca]2.0.co;2}, abstractNote={ABSTRACT In a recent morphometric analysis of the Gonolobus complex (subgenus Gonolobus) in the southeastern United States, we found former specific concepts untenable as stated, as the diagnostic characters could not consistently assign individuals to one of two groups. However, our analysis showed a strong geographical component to the distribution of individuals delimited by uniformly and multicolored corollas, which we used as a basis for suggesting that two entities do appear to exist in the Southeast that may deserve recognition at some taxonomic rank. In the present study, we performed analysis of Inter-Simple Sequence Repeats (ISSR) to assess whether the two entities are genetically differentiated and, if so, to what level. We also conducted a cladistic analysis of morphological characters of the subgenus to determine whether the entities emerge as closest relatives. Our ISSR results showed substantial genetic differentiation at 18 loci between the two entities, although no fixed differences between them were detected. At 7 loci, the frequencies of band presence are significantly higher in the multicolored corolla group (MCCG) than in the uniformly colored corolla group (UCCG). At 11 loci they are significantly higher in the UCCG. Nineteen bands are unique to the MCCG, although at various frequencies (3.5–39.0%), whereas only a single band is unique to the UCCG, suggesting that the latter possesses a subset of the MCCG gene pool and is likely a derivative of it. Analysis of 61 parsimony-informative characters using Neighbor-Joining (NJ) and Unweighted Pair-Group Method using Arithmetic means (UPGMA) did not resolve the two groups, consistent with the view of a single species. In a parsimony analysis of morphological characters of 14 species of the subgenus, the two groups consistently appear as closest relatives. This evidence indicates that the complex represents a single evolutionary lineage with two incompletely differentiated morphological subgroups. On the basis of these results, we propose to treat the MCCG and UCCG as two varieties of Gonolobus suberosus. Gonolobus granulatus Scheele is neotypified in association with the required new combination for the UCCG variety. A key to the infraspecific taxa is provided.}, journal={Harvard Papers in Botany}, author={Krings, A. and Xiang, Qiu-Yun}, year={2005}, pages={147–159} }
 @article{krings_2005, title={The flora of Nags Head Woods and the Outer Banks of North Carolina: Additions and corrections}, volume={121}, journal={Journal of the North Carolina Academy of Science}, author={Krings, A.}, year={2005}, pages={111–116} }
 @article{krings_2005, title={Typification of Ceropegia palustris Pursh and Lyonia maritima Elliott (Apocynaceae, Asclepiadoideae)}, volume={21}, journal={SIDA, Contributions To Botany}, author={Krings, A.}, year={2005}, pages={1507–1513} }
 @article{krings_2004, title={Abaxial foliar vestiture of Desmodium Desv. (Fabaceae) in North Carolina and vegetative recognition of the species}, volume={3}, journal={Vulpia}, author={Krings, A.}, year={2004}, pages={140–172} }
 @article{krings_franklin_2004, title={An annotated, preliminary checklist of the vascular flora of Camp Butner, North Carolina}, volume={21}, journal={SIDA, Contributions To Botany}, author={Krings, A. and Franklin, C.}, year={2004}, pages={1131–1139} }
 @article{krings_xiang_2004, title={The Gonolobus complex (Apocynaceae - Asclepiadoideae) in the southeastern United States}, volume={21}, journal={SIDA, Contributions To Botany}, author={Krings, A. and Xiang, Q.-Y.}, year={2004}, pages={103–116} }
 @book{krings_2003, title={Common grasses of the Carolinas}, ISBN={0974048313}, publisher={Raleigh, NC: Applied Taxonomic Solutions}, author={Krings, A.}, year={2003} }
 @article{krings_2003, title={Contributions to the flora of Nags Head Woods, I: Key to the trees and shrubs}, volume={2}, journal={Vulpia}, author={Krings, A.}, year={2003}, pages={1–14} }
 @article{krings_2003, title={Contributions to the flora of Nags Head Woods, II: Key to the vines}, volume={2}, journal={Vulpia}, author={Krings, A.}, year={2003}, pages={15–22} }
 @article{krings_2003, title={Exsiccatae of Carolina Richardia (Rubiaceae) studied in an analysis of floral variation}, volume={2}, journal={Vulpia}, author={Krings, A.}, year={2003}, pages={77–80} }
 @book{krings_2003, title={Identifying grasses, sedges, and rushes}, ISBN={097404833X}, publisher={Raleigh, NC: Applied Taxonomic Solutions}, author={Krings, A.}, year={2003} }
 @article{krings_2003, title={Typification and nomenclatural history of Trachelospermum difforme (Apocynaceae)}, volume={20}, journal={SIDA, Contributions To Botany}, author={Krings, A.}, year={2003}, pages={1641–1644} }
 @book{krings_kruger_2003, title={Wetland rushes of the Southeast}, ISBN={0974048321}, publisher={Raleigh, NC: Applied Taxonomic Solutions}, author={Krings, A. and Kruger, M. H.}, year={2003} }
 @book{krings_2003, title={Wetland vines of the Carolinas}, ISBN={0974048305}, publisher={Raleigh, NC: Applied Taxonomic Solutions}, author={Krings, A.}, year={2003} }
 @article{krings_2002, title={A new species of Gonolobus (Apocynaceae: Asclepiadeae, Gonolobinae) from southern Costa Rica}, volume={20}, number={1}, journal={SIDA, Contributions To Botany}, author={Krings, A.}, year={2002}, pages={105–108} }
 @article{krings_2002, title={Additions to the flora of Nags Head Woods (Dare County, North Carolina) and the Outer Banks of North Carolina}, volume={20}, number={2}, journal={SIDA, Contributions To Botany}, author={Krings, A.}, year={2002}, pages={839–843} }
 @article{krings_westbrooks_lloyd_2002, title={Cirsium nuttallii (Asteraceae: Cynareae): New to North Carolina and an illustrated key to southeastern congeners}, volume={20}, number={2}, journal={SIDA, Contributions To Botany}, author={Krings, A. and Westbrooks, R. and Lloyd, J.}, year={2002}, pages={845–848} }
 @article{krings_burton_york_2002, title={Commelina benghalensis (Commelinaceae) new to North Carolina and an updated key to Carolina congeners}, volume={20}, number={1}, journal={SIDA, Contributions To Botany}, author={Krings, A. and Burton, M. G. and York, A. C.}, year={2002}, pages={419–422} }
 @article{krings_2002, title={Cultivated, dicotyledonous taxa at the North Carolina State University herbarium}, volume={1}, journal={Vulpia}, author={Krings, A.}, year={2002}, pages={133–156} }
 @article{krings_2002, title={Floral variation and diagnosis of Richardia (Rubiaceae) in the Carolinas}, volume={67}, number={3}, journal={Castanea}, author={Krings, A.}, year={2002}, pages={329–330} }
 @article{krings_2002, title={Keys to the vines of Carolina wetlands}, volume={1}, journal={Vulpia}, author={Krings, A.}, year={2002}, pages={23–40} }
 @article{krings_2002, title={Nags Head Woods collections of the National Park Service Cape Hatteras National Seashore herbarium (CAHA)}, volume={118}, number={3}, journal={Journal of the North Carolina Academy of Science}, author={Krings, A.}, year={2002}, pages={145–155} }
 @article{krings_neal_2001, title={A Scutellaria (Lamiaceae) new to North Carolina and a key to the small-flowered Carolina congeners}, volume={19}, number={3}, journal={SIDA, Contributions To Botany}, author={Krings, A. and Neal, J. C.}, year={2001}, pages={735–739} }
 @article{krings_2001, title={Neotypification of Enslenia albida and a new combination in Ampelamus for Cynanchum laeve (Apocynaceae: Asclepiadoideae)}, volume={19}, number={4}, journal={SIDA, Contributions To Botany}, author={Krings, A.}, year={2001}, pages={925–929} }
 @article{krings_2001, title={North Carolina State University Herbarium (NCSC): A brief history and a preliminary overview of the collections}, volume={117}, number={4}, journal={Journal of the Elisha Mitchell Scientific Society}, author={Krings, A.}, year={2001}, pages={224–239} }
 @article{krings_neal_2001, title={South American skullcap (Scutellaria racemosa Pers., Lamiaceae) in the southeastern United States}, volume={19}, number={4}, journal={SIDA, Contributions To Botany}, author={Krings, A. and Neal, J. C.}, year={2001}, pages={1171–1179} }
 @article{krings_2001, title={Vines of a temperate state: Still undercollected?}, volume={19}, number={4}, journal={SIDA, Contributions To Botany}, author={Krings, A.}, year={2001}, pages={1147–1155} }
 @article{krings_2001, title={Vines of two Texan semi-arid desert communities: Floristic composition and ecological notes.}, volume={46}, ISSN={["0038-4909"]}, DOI={10.2307/3672444}, number={3}, journal={SOUTHWESTERN NATURALIST}, author={Krings, A}, year={2001}, month={Sep}, pages={400–404} }
 @article{krings_2000, title={A new combination for Sarcostemma cynanchoides var. hartwegii (Asclepiadaceae)}, volume={19}, number={1}, journal={SIDA, Contributions To Botany}, author={Krings, A.}, year={2000}, pages={137–138} }
 @article{krings_2000, title={A phytogeographical characterization of the vine flora of the Sonoran and Chihuahuan deserts}, volume={27}, ISSN={["0305-0270"]}, DOI={10.1046/j.1365-2699.2000.00501.x}, abstractNote={Abstract}, number={6}, journal={JOURNAL OF BIOGEOGRAPHY}, author={Krings, A}, year={2000}, month={Nov}, pages={1311–1319} }
 @article{krings_2000, title={Floristics and ecology of Mesoamerican montane climber communities: Monteverde, Costa Rica}, number={21}, journal={Selbyana}, author={Krings, A.}, year={2000}, pages={156–164} }
 @article{krings_1999, title={An annotated preliminary checklist of the dicotyledonous lianas and vines of the Las Cruces Biological Station, Costa Rica}, volume={18}, number={4}, journal={SIDA, Contributions To Botany}, author={Krings, A.}, year={1999}, pages={1247–1258} }
 @article{krings_1999, title={Observations on the pollination biology and flowering phenology of Texan Matelea reticulata (Engelm. Ex. A. Gray) Woods. (Asclepiadaceae)}, volume={46}, number={3}, journal={Madrono}, author={Krings, A.}, year={1999}, pages={155–158} }