G70 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



ligules inconspicuous except in 

 P. ravenelii; blades firm; spike- 

 lets turgid, strongly 7- to 9- 

 nerved. Autumnal culms with 

 branches more or less crowded 

 toward the summit. 

 92. Panicum wilcoxianum Vasey. 

 (Fig. 1001.) Vernal culms 10 to 25 

 cm. tall, copiously papillose-hirsute, 



F,GUEE *l&JK3to?xia&So v ' ews °' *» are sheaths and blades; ligule 1 



mm. long; blades firm, erect, 5 to 8 



shaped, 3 to 9 cm. long, 4 to 12 mm. 



wide, usually ciliate at the subcordate 



base, glabrous; panicle 4 to 10 cm. 



long; spikelets 2.3 to 2.5 mm. long, 



purple-stained at base, glabrous or 



minutely pubescent. Autumnal culms 



spreading or decumbent, flabellately 



branched at the middle and upper 



nodes. % — Low pineland, North 



Carolina, Georgia, and Florida. 



Figure 1000. — Panicum patenti folium. Two views of 

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



91. Panicum patentifolium Nash. 

 (Fig. 1000.) Vernal culms widely de- 

 cumbent-ascending, slender, 25 to 55 

 cm. tall, minutely puberulent to near- 

 ly glabrous; blades stiffly spreading, 

 2.5 to 8 cm. long, 2 to 5 mm. wide, 

 glabrous; panicle 3 to 7 cm. long; 

 spikelets 2.4 to 2.6 mm. long, obovate, 

 turgid, puberulent to nearly glabrous. 

 Autumnal phase, decumbent or 

 spreading, branching from the middle 

 and upper nodes, the branches ap- 

 pressed. % — Dry sand, especially 

 in "scrub," Georgia and Florida 

 to Mississippi. 



13. Oligosanthia. — Culms mostly 

 relatively stout, usually erect; 



Figure 1001. — Panicum wilcoxianum. Two views of 

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



cm. long, 3 to 6 mm. wide, usually 

 involute-acuminate; panicle 2 to 5 

 cm. long; spikelets 2.7 to 3 mm. long, 

 papillose-pubescent. Autumnal culms 

 branching from all the nodes, forming- 

 bushy tufts with rigid erect blades. 

 01 ■ — Prairies, Alberta and Mani- 

 toba; Wisconsin and North Dakota 

 to Illinois; Tennessee; Colorado and 

 New Mexico. 



93. Panicum malacophyllum Nash. 

 (Fig. 1002.) Vernal phase velvety or 

 velvety-pilose throughout; culms 

 slender, 25 to 70 cm. tall, ascending 

 or spreading, the nodes retrorsely 

 bearded; ligule 1 to 1.5 mm. long; 

 blades 7 to 10 cm. long, 6 to 12 mm. 

 wide; panicle 3 to 7 cm. long; spike- 

 lets 2.9 to 3 mm. long, papillose- 

 pilose. Autumnal phase spreading, 

 forming bushy topheavy clumps with 

 reduced blades. % — Sandy woods, 

 Tennessee to Kansas and Texas. 



94. Panicum heJleri Nash. (Fig. 

 1003.) Vernal culms 25 to 60 cm. 



