Setaria vulpiseta (Lam.) Roemer & J.A. Schultes  
Family: Poaceae
plains bristlegrass
[Chaetochloa vulpiseta (Lam.) A.S. Hitchc. & Chase, moreChamaeraphis composita (Kunth) Kuntze, Chamaeraphis setosa var. vulpiseta (Lam.) Kuntze, Panicum amplifolium Steud., Panicum macrourum Trin., Panicum subsphaerocarpum Salzm. ex Schltdl., Panicum vulpisetum Lam., Setaria lancifolia R.A.W. Herrm.]
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  • SW Field Guide
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FNA 2003
Common Name: plains bristlegrass Duration: Perennial Nativity: Native Lifeform: Graminoid General: Densely caespitose perennial with stems 60-120 cm, rarely branched above, scabrous below the nodes and panicles. Vegetative: Sheaths keeled, glabrous, with few white hairs at throat; ligules 2-4 mm, densely ciliate; blades 15-20 cm long, 7-15 mm wide, flat, upper surface scabrous. Inflorescence: Panicles 10-30 cm long, 1-2 cm wide, uniformly thick from base to apex, dense, rarely lobed basally, rachises scabrous and loosely pilose; bristles usually solitary, 10-20 mm, soft, antrorsely scabrous; spikelets 2-2.5 mm, subspherical; lower glumes a third to half as long as spikelets, upper glumes three-quarters as long as spikelets. Ecology: Found in sandy, loamy or clayey soils of the desert grasslands from 3,500-7,000 ft (1067-2134 m); flowers May-October. Notes: Setaria spp. have inflorescences with short, mostly contracted branches and single-seeded, hard spikelets subtended by persistent bristles that remain on the plant after the spikelets have fallen.This species is distinguished by its scabrous to puberulent leaf blades and spikelike inflorescence. Ethnobotany: Unknown Etymology: Setaria is from Latin saeta, a bristle or hair, while vulpiseta is named for German botanist Johann Samuel Vulpius (1760-1846). Synonyms: Setaria macrostachya, Chaetochloa vulpiseta, Panicum vulpisetum Editor: SBuckley, 2010
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Kathy M. Davis, University of Florida Herbarium
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