MANUAL OF THE GRASSES OF THE UNITED STATES 



743 



the middle; sheaths and lower part of the blades appressed- villous, 

 the blades about 2 mm wide; racemes 2 to 4, mostly 2, on long flexu- 

 ous peduncles exserted from long narrow spathes, the slender rachis 

 very flexuous, the joints and pedicels much longer than the sessile 

 spikelet, long- villous, the lowermost rachis joint often elongate; 

 sessile spikelet 5 to 6 mm long, slender, the awn loosely twisted, 

 mostly about 2 cm long; pedicellate spikelet reduced to a slender 

 glume or obsolete. % — Dry sandy pine woods, Florida, Missis- 

 sippi, and Louisiana. 



Figure 1658.— Andropogon campy lor acheus, X 1. 

 (Combs 677, Fla.) 



Figure 1659.— Andropogon urightii, 

 X 1. (Metcalfe 1371, X. Mex.) 



Section 3. Amphilophis Trin. 



Perennials, simple or sparingly branching; racemes several to numer- 

 ous in a leafless panicle, at least the lower racemes short-peduncled, 

 mostly on a relatively long axis; rachis straight, the joints and 

 pedicels flat, with thick bearded margins, the center subhy aline. 

 28. Andropogon wrightii Hack. (Fig. 1659.) Plants somewhat 

 glaucous; culms tufted, 50 to 100 cm tall, simple, the nodes usually 

 hispid; blades flat, 3 to 5 mm wide, tapering to a fine point; racemes 

 3 to 7, suberect, mostly 3 to 6 cm long, green or tawny, not conspicu- 

 ously woolly, the hairs of rachis joints and pedicels much shorter than 

 the spikelets; peduncle usually long-exserted ; sessile spikelet about 

 6 mm long, short-pilose at base, the first glume several-nerved toward 

 the summit, stiffly short-ciliate on the keels above; awn twisted below, 

 geniculate, 10 to 15 mm long; pedicellate spikelet about as large as 

 the sessile one, awnless. % — Rocky hills and mesas, southern New 

 Mexico, and northern Mexico. An occasional spikelet is found with 

 a pitted first glume. In Mexican specimens the glumes are com- 

 monly pitted. 



