Quick Quiz: Nouns Score: Change category, Flip order Reset Incorrect! Try again. Definition: genus of trees and shrubs widely naturalized in southern United States and West Indies; coextensive with the family Casuarinaceae and order Casuarinales Your choice? genus casuarina genus cercis  (Definition: deciduous shrubs and trees of eastern Asia, southern Europe and the United States) genus chara genus choloepus