Aquatic or marsh herbs with creeping rootstocks; leaves nerved, linear, sessile; flowers monoecious, numerous on a spadix destitute of proper floral envelope; fruit nut-like, usually splitting on one side.
I. Typha. (Tourn.) L.
I. T. latifolia. L. Broad-leaved Cat-tail.
Marsh or aquatic herbs with erect or floating stems; leaves alternate, linear, sessile, two-ranked; flowers monoecious with in-globular, sessile or pedunculate heads; fruit nut-like, obovoid or spindle-shaped.
I. Sparganium. (Tourn.) L.
1. S. simplex. Huds. Simple-stemmed Bur-reed.