MANUAL OF THE GRASSES OF THE UNITED STATES 



673 



Figxjbe 1007. — Panicum leibergii. Two views of 

 spikelet, and floret, X 10. (Type.) 



or scabrous; sheaths papillose-hispid 

 with spreading hairs; ligule obsolete 

 or nearly so; blades ascending or 

 erect, rather thin, 6 to 15 cm. long, 

 7 to 15 mm. wide, papillose-hispid 

 on both surfaces, often sparsely so 

 above; panicle 8 to 15 cm. long, less 

 than half as wide; spikelets 3.7 to 

 4 mm. long, strongly papillose-hispid. 

 Autumnal phase leaning, sparingly 

 branching from the middle and lower 

 nodes. % — Prairies, New York 

 and Pennsylvania to Manitoba and 

 North Dakota, south to Ohio and 

 Kansas; Texas. 



99. Panicum xanthophysum A. 

 Gray. (Fig. 1008.) Vernal phase 

 yellowish green; culms 20 to 55 cm. 

 tall, more or less scabrous; sheaths 

 sparsely papillose-pilose; blades erect 

 or nearly so, rather thin, prominently 

 nerved, 10 to 15 cm. long, 1 to 2 cm. 

 wide, glabrous except the ciliate base; 

 panicle 5 to 12 cm. long, very narrow, 

 few-flowered, the stiff branches erect 

 or nearly so; spikelets 3.7 to 4 mm. 

 long, blunt, pubescent. Autumnal 



phase erect or ascending, branching 

 from the second and third nodes, the 

 branches erect, mostly simple. % 

 — Sandy or gravelly soil, Quebec to 

 Manitoba, south to Pennsylvania, 

 West Virginia, and Minnesota. 

 14. Pedicellata. — Culms slender from 

 a knotted crown; sheaths papil- 

 lose-hirsute; ligules about 1 mm. 

 long; blades long-ciliate at least 

 toward base; spikelets attenuate 

 at base, 7- to 9-nerved, papillose- 

 pubescent. Autumnal culms free- 

 ly branching, the branches ap- 

 pearing before the maturity of 

 the primary panicle; no distinct 

 winter rosette formed. 

 100. Panicum pedicellatum Vasey. 

 (Fig. 1009.) Vernal culms erect or as- 

 cending, 20 to 50 cm. tall, usually 

 ascending-hirsute, at least below; 

 blades 5 to 9 cm. long, 3 to 6 mm. 

 wide, glabrous or sometimes mi- 

 nutely hispid; panicle 3 to 6 cm. 

 long; spikelets 3.5 to 3.7 mm. long, 

 elliptic; first glume about half as 

 long as the spikelet, acute, the 



Figure 1008. — Panicum xanthophysum. Two views of spikelet, 

 and floret, X 10. (Type.) 



