Tillandsioideae is a subfamily of plants in the bromeliad family Bromeliaceae. This group contains the fewest genera (9) but the greatest number of species (1,277). Most are epiphytic or lithophytic, growing in trees or on rocks where they absorb water and nutrients from the air. Spanish moss of the Tillandsia genus is a well-known variety. Bromeliads in the genera Guzmania and Vriesia are the more commonly cultivated members of this subfamily.