| Noun | 1. | genus Pinckneya - small genus of shrubs or small trees of southeastern United States and northern South America asterid dicot genus - genus of more or less advanced dicotyledonous herbs and some trees and shrubs family Rubiaceae, madder family, Rubiaceae - widely distributed family of mostly tropical trees and shrubs and herbs; includes coffee and chinchona and gardenia and madder and bedstraws and partridgeberry bitter-bark, Georgia bark, Pinckneya pubens, fever tree - ornamental shrub or small tree of swampy areas in southwestern United States having large pink or white sepals and yielding Georgia bark for treating fever |