A tropical American herb (Eichhornia crassipes) forming dense floating masses in ponds and streams and having large bluish-purple flowers and leafstalks with greatly inflated bases.

• 凤眼蓝：一种热带美洲草本植物（风眼莲风眼莲属），在池塘和溪流上形成密密漂浮的一片，生有大蓝紫色花朵和带膨胀基部的叶柄