What is "psidium"

n. (context botany English) Any member of the genus ''Psidium'' of guava plants.

Psidium is a group of trees and shrubs in the myrtle family, described as a genus by Linnaeus in 1753. It is native to warmer parts of the Western Hemisphere ( Mexico, Central and South America, the West Indies, Galápagos, and the southern United States).

Psidium (foaled 1958) was an Irish-bred, British-trained Thoroughbred racehorse and sire. In a racing career that lasted from 1960 to 1961 Psidium ran eleven times and won twice. He is best known for his win, as a 66/1 outsider in the 1961 Epsom Derby. He later became a successful stallion.