Hystrix patula Moench. Bottlebrushgrass Habit: Perennial, with rhizomes. Culm: 60-120 cm. tall, slender, simple. Blades: 7-25 cm. long, 7-15 mm. wide, tapering to both ends, smooth beneath, scabrous above, flat, spreading. Sheaths: Glabrous or scabrous, rarely retrorsely pubescent. Ligule: Membranous. Inflorescence: Loosely flowered terminal spike, 7-15 cm. long, short-exserted or partially included, nodding, the internodes of the slender flattened rachis 5-10 mm. long. Spikelets: Mostly in pairs on very short pedicels, 1-1.5 cm. long, exclusive of awns, at first erect but soon widely spreading, 2-4-flowered, rachilla articulate below the lemmas. Glumes: Reduced to short or minute awns, the first usually obsolete, both often wanting in the upper spikelets. Lemmas: 8-12 mm. long, acuminate, lanceolate, rigid, convolute, rounded on the back, 5-nerved, the nerves obscure except towards the tip, pubescent at least at the summit or nearly glabrous, tapering into a long slender, straight awn, 1-4 cm. long. Palea: About as long as the body of its lemma. Fruit: Grain oblong, pubescent at the summit, free within the lemmas and palea. Habitat: Moist or rocky woods. June-July. Kansas Range: East fourth. Synonyms: Elymus hystrix L. var. hystrix Hystrix hystrix (L.) Millsp.