Hairy Cupgrass

Description

Annual. Culms erect or geniculately ascending, branching, 30-100 cm tall, nodes pubescent. Leaf sheaths loose, glabrous, pubescent or ciliate along one margin; leaf blades broadly linear, 5-25 - 0.5-1.5 cm, pubescent, margins firm, wavy, scaberulous, apex acute. Inflorescence axis 7-15 cm; racemes 4-8, 1.5-4 cm, erect or only slightly diverging; spikelets single, closely overlapping in 2 rows; axis and rachis densely pubescent, rachis margins and pedicels villous with spreading hairs. Spikelets ovate-elliptic, plump, thinly cartilaginous, dully shining, 4.5-5(-6) mm, acute, basal swelling ca. 0.5 mm; free portion of lower glume a ca. 0.2 mm truncate frill; upper glume and lower lemma 5-7-veined, puberulous, lower palea absent; upper lemma weakly rugulose, subacute. Fl. and fr. Jul-Oct. 2N = 54.