Guava (from Arawak via Spanish guayaba), is a genus of about 100 species of tropical shrubs and small trees in the myrtle family Myrtaceae, native to Mexico, the Caribbean, Central America and northern South America, but now cultivated throughout the tropics. In Hindi as well as Urdu they are called amrood . In Sri Lanka they are called Pera. The Bengali name peyara and the Tagalog name bayabas are probably local renditions of guayaba. Numerous references in medical research identify guava as Psidium guajava.
They are typical Myrtoideae, with tough dark leaves that are opposite, simple, elliptic to ovate and 5-15 cm long. The flowers are white, with five petals and numerous stamens.