Calamagrostis

Perennial, robust, tufted, long-rhizomatous. Leaf blade expanded; ligule an unfringed membrane. Inflorescence a panicle, linear, usually rather narrow, contracted and dense; spikelets shortly pedicelled. Spikelet usually 5.5-8.0 mm long, laterally compressed, disarticulating above glumes, linear, narrow, acuminate; glumes subequal, linear-lanceolate, longer than spikelet, firmly membranous, keeled upwards, scaberulous, awnless; lower glume 1-nerved; upper glume 1-3-nerved. Floret 1, bisexual, lemma less firm to similar in texture to glumes, hyaline, glabrous, 3-5-nerved, truncate-denticulate or lobed, awned from back well below apex, awn short, fine and straight, not extending beyond glumes; callus hairy, hairs white, as long as or longer than lemma; palea as long as lemma or shorter, 2-nerved, hyaline. Lodicules 2, hyaline, glabrous. Stamens 3. Ovary glabrous; styles plumose. Caryopsis narrowly ellipsoid. x= 7 (high polyploidy).