Tetrathylacium
Tetrathylacium is a genus of two species of shrubs and small trees in the family Salicaceae native to the southern Central America and northern South America. Previously it was treated in the family Flacourtiaceae but was moved along with its close relatives to the Salicaceae based on analyses of DNA data. "Tetrathylacium" is rather unique in the Samydaceae in having tightly arranged panicles of spikes, four sepals and stamens, and non-arillate seeds. The stems are often inhabited by ants, and "T. macrophyllum" is suspected to have locust pollination.