Flowers: Blooms June to July. Inflorescence on a stalk, about as tall as the leaf tips. Staminate and pistillate flowers grow separately on the same stalk (staminate above pistillate), with a naked gap on the stem of 1/2 to 3 inches.
Seeds: Small seed with long hairs attached; blow in the wind.
Habitat: Ponds, streams, river banks, and other wet areas. Sometimes grows out of the water on the edge of water body.
Elevation: To about 5,000 ft.
Distribution: Warm temperate and tropical areas worldwide.
Comments: All three North America species hybridize.