| + | Plants forming colonies, slender or stout, often tall, smooth: rhizome strong, creeping: sts. erect, simple, base often under water: radical lvs. linear-elongated, rather thick, spongy, with or without ribs; cauline lvs. few and shorter: peduncles erect, terete, strict and not divided: spadices, male and female similar, superposed: fls. monoecious, densely clustered in the cylindrical spadix; perianth consisting of slender hairs: fr. minute, subsessile. — About 17 species, temperate and tropical regions. Monographed by Graebner in Engler's Pflanzenreich, hft. 2 (IV. 8) in 1900. |