134 PANIC ACE.E. 



the margins near the base, 4-6 cm. long, 5 mm. wide. Panicle 

 simple, narrow, 4-6 cm. long. Spikelets ovate or oblong, pubes- 

 cent or smooth, acute, 4 mm. long; first glume ovate-acute, 

 3-6-nervecl; second glume and the floral glume of the staminate 

 s^Dikelet ovate, acute, with a crest of close liairs a little way from eacli 

 margin, 11-13-nerved; palea oblong, acute, 5-nerved, as long as its 

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

 East Texas, BucMcij, Hall 824, Nealley. 



52. P. velutinosum Nees, Agrost. Bras. 121 (1829). 



A branching, somewhat diffuse annual, 30-60 cm. liigh. 

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

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

 long, 4-6 mm. wide. Panicles thin. 10-17 cm. long, linear or 

 spreading; rays hirsute, distant, slightly sjireading, the longest 

 3-5 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 glume very hard, 

 5-nerved, 2 mm. long, second 7-nerved; floral glume of the neuter 

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

 lines. 



Arizona, Pringle, Lemmon 3062 ; Mexico, Palmer 159, 208. 



53. P. microspermum Fourn. Ilemsl. Biol. Centr. Am. Bot. 

 3:492 (1880). 



Culms branching below and decumbent, 30-70 em. 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, 6-15 cm. 

 long, 12-15 mm. wide. Panicle diffuse, broadly ovoid, 16-20 cm. 

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

 l)rauching near the base, diverging or reclined, the axils enlarged 

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

 and flexuose. Spikelets all padicellate, 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 Ib'i; Mexico, Palmer \^5^. 



