Rodríguez-Peña, R.A. and Wolfe, A.D. 2023. Effect of climate, anther morphology and pollination syndrome on pollen availability in Penstemon: Factors that affect pollen availability in Penstemon. Journal of Pollination Ecology. 35, (Dec. 2023), 296–311. DOI:https://doi.org/10.26786/1920-7603(2023)703.