the margins near the base, 4-0 urn. long, 5 nun. wide. Paniule 

 simple, narrow, i-i) cm. long. S])ikulots ovato or oblong, piibi's- 

 cent or smooth, acute, -t mm. long; first glume ovate-acute, 

 3-6-nerved; second glume aiul tlie lloral glume of the staminate 

 spilvelet ovate, acute, with a crest of close luiirs a little way from each 

 margin, U-lIJ-nerved; jialea oblong, acute. 5-nerved, as long as its 

 glume. Stamens ){. Fertile floret oval, almost acute, 3 mm. long. 



East Texas, Htirklci/, Hall &Z\, Aeallei/. 



5'Z. P. velutinosum Nees, Agrost. Bras. 121 (1820). 



A branebing, somewhat diffuse annual, 30-00 cm. high. 

 Culms hirsute more or less. SheatJjS smooth or nearly so; ligule a 

 ciliate ring; blades hirsute, flat, cordate, acuminate, 7-13 cm. 

 long, -i-G mm. wide. I'anicles thin, 10-17 cm. long, linear or 

 si)reading; rays hirsute, distant, slightly spreading, the longest 

 3-.") cm. long, bearing 8-14 spikelets. Spikelets mostly subsessile 

 (the pedicel hairy), clothed with short, spreading pubescence, oval, 

 subacute at both ends, about 3.4 mm. long; first ghune very Inird, 

 5-nerved, 3 mm. long, secon<l 7-nerved; floral ghune of the mniter 

 floret oval, mucroiuite, 2.5 mm. long, finely rugose with transverse 

 lines. 



Arizona, Pringle, Lenimon 3002; ^Mexico, Palmer 150, 208. 



53. P. microspermum Fourn. llemsl. Biol, t'ontr. Am. Bot. 

 3:492 (1880). 



Culms branching below and decumbent, 30-70 cm. or more 

 high. Sheaths slightly ciliate on the margins, about two-thirds as 

 long as the internodes; ligule a ciliate ring; blades smooth, flat, 

 linear-lanceolate, contracted, but cordate at the base, 0-15 cm. 

 long, 12-15 mm. wide. Panicle diffuse, broadly ovoid, 10-20 cm. 

 long, the rays mostly single, but some of them in pairs, very soon 

 branching near the base, diverging or reclined, the axils eidarged 

 and glandular; rays stiff, spreading at wide angles, hairlike, straight 

 and flexuose. Spikelets all p^'dicellate, broadly oval, scarcely 

 pointed, 1.1-1.2 mm. long, yellowish green with a finely glandular 

 surface; empty glumes brittle, first minute, second and third 

 equal, 5-nerved ; floret persistent, as long as its glumes. 



Cuba, Wright 753; Mexico, Pcthncr 1257. 



