This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol1", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
A tall aquatic monoecious grass with long flat leaf-blades and an ample panicle. Spikelets 1-flowered, the pistillate borne on the upper branches of the panicle, the staminate on the lower. Scales 2, membranous, the outer somewhat longer, acute in the staminate, long-awned in the pistillate spikelets. Stamens 6. Styles nearly distinct. Grain linear. [From an ancient Greek name for Darnel.]
A monotypic genus of North America and Asia. Type species: Zizania aquatica L.
Zizania aquatica L. Sp. PL 991. 1753. Zisania palustris L. Mant. 295. 1771.
Culms erect from an annual root, 3°-10° tall, smooth and glabrous. Sheaths loose, glabrous; ligule about 1/4 long, thin-membranous; blades 1° or more long, 1/4'-1 1/2' wide, more or less roughened, especially above, glabrous; panicle 1°-2° long, the upper branches erect, the lower ascending or spreading; staminate spikelets 3"-6" long, scales acute or awn-pointed, outer 5-nerved, the inner 3-nerved; scales of the linear pistillate spikelets 4"-12" long, the outer one 5-nerved, with an awn 1'-2' long, the inner narrower, 3-nerved, awn-pointed.