MANUAL OP THE GRASSES OF THE UNITED STATES 



671 



short-pointed, 2.2 to 2.6 mm long. Qj. Ballast at Mobile, 

 Ala., and at a few points in southeastern Texas. Adventive from 

 South America. 



132. Panicum filipes Scribn. (Fig. 1500.) Culms 30 to 80 cm 

 tall, erect or ascending; blades laxly ascending or spreading, 10 to 

 25 cm long, 3 to 8 mm wide, flat, 



glaucous, glabrous or sometimes 

 sparsely hirsute beneath; panicles 7 

 to 25 cm long, usually equaled or 

 exceeded by the upper blades, the 

 distant branches spreading; spikelets 

 2 to 2.6 mm long. 2J. Low open 

 ground or among chaparral, Louisi- 

 ana (Shreveport) and Texas; north- 

 eastern Mexico. Distinguished from 

 P. hallii by the longer blades, looser 

 panicle, and smaller spikelets. 



133. Panicum hallii Vasey. 

 HALL'S PANICUM. (Fig. 1501.) Some- 

 what glaucous green, leaves usually 

 crowded toward the base, the blades 

 curling like shavings with age; 

 culms erect, 1 5 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 



riliatp tnwarrl HOQP ntViprwidP crln FIGURE 1501. Panicum hallii. Plant, X 1; two 



mate rowara oase, omerwise gia- views of spikelet> and floret> x 10 ' (T ype.) 

 brous or nearly so ; panicle 6 to 20 cm 



long, the few branches stiffly ascending; spikelets 3 to 3.7 mm long. 

 2J. Dry prairie, rocky and gravelly hills and canyons, and in bottom 

 lands and irrigated fields, Texas to Arizona; Mexico. 



134. Panicum lepidulum Hitchc. 

 and Chase. (Fig. 1502.) Culms 25 

 to 70 cm tall, erect, usually spar- 

 ingly branching from lower nodes, 

 sparsely 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 scarcely half as 

 wide, branches ascending with short 

 spreading branchlets with 1 to 3 

 spikelets ; spikelets 4 to 4.2 nun long, 

 turgid. 01 Moist places mostly 

 in the uplands, New Mexico, Ari- 



vrvno an r\ TV/Tovinri 



ZOna, and iVlexiCO. 



135. Panicum ghiesbreghtii 



Fourn. (Fig. 1503.) Culms erect, rather robust, 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 glabrescent; panicles 20 

 to 30 cm long, usually less than half as wide, the branches ascending, 



55974 35 - 43 



FlGURE 1502. Panicum lepidulum. Two views 



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



