观赏草是可广泛用于各种生境造园的以禾本科植物为主的植物统称，它也包括部分莎草科、灯心草科、花蔺科等植物。
Ornamental grasses are those plants of Gramineae can be widely used in various gardens ; they also include some plants of Cyperaceous , Juncaceae , and Butomaceae .
花蔺