Livshultz, Tatyana, Sonja Hochleitner, and Elizabeth Lakata. “Pollen Transfer Efficiency of Apocynum Cannabinum (Apocynaceae): A Comparative Perspective”. Journal of Pollination Ecology 22 (March 5, 2018): 35–48. Accessed November 21, 2024. https://pollinationecology.org/index.php/jpe/article/view/454.