| Noun | 1. | genus Casuarina - genus of trees and shrubs widely naturalized in southern United States and West Indies; coextensive with the family Casuarinaceae and order Casuarinales dicot genus, magnoliopsid genus - genus of flowering plants having two cotyledons (embryonic leaves) in the seed which usually appear at germination Casuarinaceae, family Casuarinaceae - one genus: genus Casuarina casuarina - any of various trees and shrubs of the genus Casuarina having jointed stems and whorls of scalelike leaves; some yield heavy hardwood she-oak - any of several Australian trees of the genus Casuarina beefwood - any of several Australian trees of the genus Casuarina yielding heavy hard red wood used in cabinetwork Australian pine, Casuarina equisetfolia - common Australian tree widely grown as an ornamental in tropical regions; yields heavy hard red wood |