Irene Palmer Palmer, I. E., Gehl, R. J., Ranney, T. G., Touchell, D., & George, N. (2014). Biomass yield, nitrogen response, and nutrient uptake of perennial bioenergy grasses in North Carolina. BIOMASS & BIOENERGY, 63, 218–228. https://doi.org/10.1016/j.biombioe.2014.02.016 Palmer, I. E., Ranney, T. G., Lynch, N. P., & Bir, R. E. (2009). Crossability, cytogenetics, and reproductive pathways in Rudbeckia subgenus Rudbeckia. HortScience, 44(1), 44–48. https://doi.org/10.21273/HORTSCI.44.1.44