A unisexual (early male) umbel of Bomarea acutifolia, a hummingbird-pollinated vine in the mountains of Costa Rica. Following the male phase, each flower continues to produce nectar during a week-long neuter phase and then becomes female. Thus, each umbel is temporally unisexual and opportunities for self-pollination are limited.
Items posted on the Botanical Society of America's website by the author/creator are licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported License. We value sharing, growing and learning together. In the spirit of fairness, we believe in the attribution of materials and ensuring the appropriate voices are in place when considering further use.