672 



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



Louisiana and New Mexico. Closely 

 related to P. scribnerianum. 



95. Panicum scribnerianum Nash. 

 (Fig. 1004.) Vernal culms 20 to 50 

 cm. tall, glabrous or harshly pu- 

 berulent or sometimes ascending- 

 pilose; sheaths striate, papillose-his- 

 pid to nearly glabrous; blades as- 

 cending or erect, 5 to 10 cm. long, 

 6 to 12 mm. wide, firm, rounded at 

 the ciliate base, glabrous on the 

 upper surface, appressed-pubescent 



Figtjhe 1005. — Panicum oligosanthes. Two views of 

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



96. Panicum oligosanthes Schult. 

 (Fig. 1005.) Vernal culms 35 to 80 

 cm. tall, appressed-pubescent, es- 

 pecially below; sheaths with as- 

 cending papillose pubescence; blades 

 stiffly spreading or ascending, 6 to 

 14 cm. long, 5 to 8 mm. wide, gla- 

 brous or nearly so on the upper 

 surface, harshly puberulent beneath; 

 panicle 6 to 12 cm. long; spikelets 

 long-pediceled, 3.5 to 4 mm. long, 

 subacute, sparsely hirsute. Autumnal 

 phase erect to spreading, branching 

 freely from the upper nodes. % — 

 Sandy, usually moist woods, Massa- 

 chusetts and Michigan to Iowa, south 

 to Florida and Texas. 



97. Panicum ravenelii Scribn. and 

 Merr. (Fig. 1006.) Vernal culms 30 

 to 70 cm. tall, densely papillose- 

 hirsute with ascending hairs, the 

 nodes short-bearded; sheaths hirsute 

 like the culm; ligule 3 to 4 mm. long; 

 blades thick, 8 to 15 cm. long, 1 to 

 2 cm. wide, glabrous on the upper 

 surface, densely velvety-hirsute be- 

 neath; panicle 7 to 12 cm. long; 

 spikelets 4 to 4.3 mm. long, sparsely 

 papillose-pubescent. Autumnal phase 



I ( 







t \ • 







Figure 1006. — Panicum ravenelii. Two views of spikelet, and 

 floret, X 10. (Type.) 



to glabrous beneath; panicle 4 to 8 

 cm. long; spikelets 3.2 to 3.3 mm. 

 long, obovate, blunt, sparsely pubes- 

 cent to nearly glabrous. Autumnal 

 phase branching from the middle and 

 upper nodes. 01 — Sandy soil or 

 dry prairies, Maine to British Colum- 

 bia and Washington, south to Vir- 

 ginia, Mississippi, Texas, and Ari- 

 zona; Mexico. 



more or less spreading, branching 

 from the middle and upper nodes, 

 the short branches crowded at the 

 summit. % — Sandy or gravelly 

 woods or open ground, Delaware to 

 Missouri, south to Florida and Texas. 

 98. Panicum leibergii (Vasey) 

 Scribn. (Fig. 1007.) Vernal culms 

 slender, 25 to 75 cm. tall, erect from 

 a more or less geniculate base, pilose 



