G92 MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



pilose to scabrous; blades suberect, 7 

 to 30 cm. long, 5 to 10 mm. wide, 

 sparsely papillose-pilose to nearly 

 glabrous; panicle 7 to 20 cm. long, 

 usually scarcety half as wide, branches 

 ascending with short spreading 

 branchlets with 1 to 3 spikelets; 

 spikelets 4 to 4.2 mm. long, turgid. 

 Ql — Moist places mostly in the up- 

 lands, Utah, New Mexico, Arizona, 

 and Mexico. 



Figure 1050. — Panicum Jiallii. Plant, X 1; two views 

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



ally equaled or exceeded by the upper 

 blades, the distant branches spread- 

 ing; spikelets 2 to 2.6 mm. long. % 

 — Low open ground or among chapar- 

 ral, Louisiana (Shreveport) and 

 Texas; northeastern Mexico. Dis- 

 tinguished from P. hallii by the 

 longer blades, looser panicle, and 

 smaller spikelets. 



141. Panicum hallii Vasey. Hall's 

 panicum. (Fig. 1050.) Somewhat 

 glaucous green, leaves usually 

 crowded toward the base, the blades 

 curling like shavings with age; culms 

 erect, 15 to 60 cm. tall; sheaths 

 sparsely papillose-hispid to glabrous; 

 blades erect or nearly so, flat, 4 to 15 

 cm. long, 2 to 6 mm. wide, sparsely 

 ciliate toward base, otherwise gla- 

 brous or nearly so;. panicle 6 to 20 

 cm. long, the few branches stiffly as- 

 cending; spikelets 3 to 3.7 mm. long. 

 % — Dry prairie, rocky and gravelly 

 hills and canyons, and in bottom 

 lands and irrigated fields, Oklahoma 

 and Colorado to Texas and Arizona; 

 Mexico. 



142. Panicum lepidulum Hitchc. 

 and Chase. (Fig. 1051.) Culms 25 to 

 70 cm. tall, erect, usually sparingly 

 branching from lower nodes, sparsely 



Figure 1051. — Panicum lepidulum. Two views of 

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



143. Panicum ghiesbreghtii Fourn. 

 (Fig. 1052.) Culms erect, rather ro- 

 bust, ascending-hirsute, 60 to 80 cm. 

 tall, the nodes densely hirsute; blades 

 as much as 60 cm. long and 12 mm. 

 wide, flat, papillose-hirsute to gla- 

 brescent; panicles 20 to 30 cm. long, 

 usually less than half as wide, the 

 branches ascending, naked at base, 

 the branchlets more or less appressed ; 

 spikelets 3 mm. long, 1 mm. wide. 

 91 — Low moist ground, southern 

 Texas; tropical America. 



Figure 1052. — Panicum ghiesbreghtii. Two views of 

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



