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Arundinoideae

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Inflorescences

Dissections:
Cinna arundinacea

Line drawings

CINNA L.
Plants hermaphroditic, caespitose or rhizomatous, perennial. Culms erect or ascending, glabrous; internodes hollow, terete. Leaves cauline, not distinctly distichous; sheaths terete, margins open; auricles absent; ligules membranous; blades flat, linear, lax. Panicles narrow or open, primary branches ascending (secondary branches ascending). Spikelets solitary, laterally compressed, disarticulation below glumes, mucronate, pedicellate; florets l, reduced floret absent, callus glabrous, rachilla extending or not extending beyond upper floret; glumes 2, first 1-veined, second 3-veined, nearly equal, nearly equal to spikelet length, glabrous, awnless; lemmas 3-5- veined, membranous, glabrous or scabrous, apex slightly bifid, mucronate from between lobes of bifid apex, veins glabrous or scabrous; paleas 1-veined, awnless, glabrous. Stamens 1-2 (rarely 3); anthers tan. Caryopses with pericarp free, laterally compressed, endosperm liquid. Base chromosome number x=7.

A temperate genus of about four species. Most of the taxa occur in wetlands. This is a shade tolerant species that occur along streams and in meadows.