Dense Silkybent

Agrostis interrupta L. Syst. Nat. ed. 10. 872. 1759
Apera interrupta Beauv. Agrost. 31, 151. 1812. (Based on Agrostis interrupta L.) Anemagrostis interrupta Trin. Fund. Agrost. 129. 1820. (Based on Agrostis interrupta L.) Muhlenbergia interrupta Steud. Syn. Gram. 177. 1854. (Based on Agrostis interrupta L.) Agrostis Spica-venti subsp. interrupta Hook. f. Stud. Fl. 432. 1870. (Based on A. interrupta L.) Agrostis Anemagrostis subsp. interrupta Syme, Engl. Bot. ed. 3. 11: 44. 1873. (Based on A.
interrupta L.) Apera Spica-venti var. interrupta Beal, Grasses N. Am. 2: 357. 1896. (Based on Agrostis interrupta
L.) Agrestis interrupta Bubani, Fl. Pyren. 4: 289. 1901. (Based on Agrostis interrupta L.)
Annual; culms usually much branched at base, erect or geniculate at base, glabrous, 2or 3-noded, 20-60 cm. tall; sheaths glabrous; ligule thin, acute, 2-4 mm. long; blades scabrous, mostly less than 5 cm. long, about 1 mm. wide; panicle narrow, rather dense, erect or somewhat nodding, interrupted, 5-15 cm. long, about 1 cm. wide, the branches whorled, ascending or appressed, 1-4 cm. long, some of them floriferous to base; spikelets green, the lateral pedicels about 1 mm. long; glumes acuminate, scabrous on the keel, somewhat unequal, the second somewhat longer, 2.5-3 mm. long; lemma scaberulous above, about 2 mm. long, the callus minutely pilose, the awn from below the apex, straight, about 1 cm. long; prolongation of the rachilla about 0.3 mm. long.
Type locality: Europe.
Distribution: Introduced in Missouri (St. Louis), Idaho (Nezperce Forest), and British Columbia (Okanogan); native of western Europe.