The two spear-shaped wings of Anisoptera tree seeds enable long-distance dispersal because they are asymmetrical.

Anisoptera, one of the tallest of the trees in the same Asiatic forests, also has two wings, but they are spear-shaped and curve upwards and outwards. As its name suggests, they are also unequal in length. This asymmetry causes them to spin when they are released, and the seed resembles a tiny whirling helicopter, which may travel even further than a double-winged glider.” (Attenborough 1995:19)

Last Updated August 18, 2016