These are representative examples of flowers with high (left) and low (right) natural frequency stamens. Flowers were stored in 60 percent ethanol and photographed using a dissection microscope.

This orchid species is native to the cloud forests of Ecuador and Peru, where it grows at high altitudes of 1,000 to 2,000 meters. Its name comes from the Latin words “dracula”, meaning “little dragon ...

Recent advances in molecular phylogenetics and a series of important palaeobotanical discoveries have revolutionized our understanding of angiosperm diversification. Yet, the origin and early ...