Panicum agrostoides

Panicum agrostoides Spreng. Pugill. 2: 4. 1815
Panicum rigidulum Bosc; (Spreng. Syst. 1: 320, as synonym. 1825) Nees, Agrost. Bras. 163.
1829.
Agrostis polystachya Bosc; Steud. Nom. ed. 2. 1: 40, as synonym. 1840. Panicum elongatum ramosius C. Mohr, Contr. U. S. Nat. Herb. 6: 357. 1901.
Plants in dense clumps, from a short caudex, with numerous shoots of short leaves at the base, erect, glabrous throughout except as noted, 50-100 cm. high or more; culms rather stout, compressed; leaf-sheaths longer than the internodes, keeled, occasionally pilose on the sides at the juncture with the blade; ligule erose, about 1 mm. long; blades erect, conduplicate at the base, but flat above or sometimes drying involute, 20-50 cm. long, rarely longer, 5-12 mm. wide; panicles terminal and axillary, finally long-exserted, 10-30 cm. long, rarely longer, usually half to two thirds as wide but occasionally diffuse and nearly as wide as long, the stiff branches ascending or sometimes spreading at maturity, with more or less divergent, densely flowered branchlets, commonly from the lower side, the ultimate branchlets and short pedicels appressed, scabrous, the latter usually bearing at the summit one to several delicate white hairs, these often one fourth to one third as long as the spikelet; spikelets 1.8-2 mm. long, in occasional specimens 2.2 mm. long, 0.7-0.8 mm. wide; first glume hardly half the length of the spikelet; second glume and sterile lemma subequal, 5 -nerved, the midnerves scabrous at the summit; fruit 1.3 mm. long, 0.6 mm. wide.
Type locality: Pennsylvania.
Distribution: Maine to Kansas, and south to Florida and Texas; California.