Tropical plants grow cool flowers

By shifting the positions of their flowers, two tropical species keep their blooms at comfortable temperatures for pollinators, say researchers.

Ipomoea pes-caprae and Merremia borneensis in the morning glory family don’t track the sun’s passage exactly, but they do generally keep blooms facing sunward during the flowering season, say Sandra Patio of the Instituto Humboldt in Bogot, Colombia, and her colleagues.