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



FIGURE 1005. Distribution of 

 Hilaria jamesii. 



widened toward the ciliate summit, the nerves flabellate, not excur- 



rent or barely so; fertile spikelet about equaling the lateral ones, its 



glumes strongly keeled, cleft into few to several narrow ciliate lobes 

 and slender awns ; lemma exceeding the glumes, 

 mucronate between 2 rounded lobes. 91 (Pleu- 

 raphis mutica Buckl.) Dry plains and hills, 

 Texas to Arizona and northern Mexico . 



3. Hilaria jamesii (Torr.) Benth. GALLETA. 

 (Fig. 1004.) Plants erect, the base often decum- 

 bent or rhizomatous, bearing also tough scaly 

 rhizomes; culms glabrous, the nodes villous; 

 sheaths glabrous or slightly scabrous, sparingly 



villous around the short membranaceous ligule; blades mostly 2 to 5 



cm long, 2 to 4 mm wide, rigid, soon involute, the upper reduced ; group 



of spikelets 6 to 8 mm long, long-villous at base, similar to those of H. 



rigida, but the glumes of 



lateral spikelets acute, 



usually with a single 



awn; lemma of the fer- 

 tile spikelet exceeding 



its glumes. 9i (Pleu- 



raphis jamesii Torr.) 



Deserts, canyons, and 



dry plains, Wyoming 



and Utah to Texas and 



Inyo County, Calif, (fig. 



1005). 

 4. Hilaria rigida 



(Thurb.) Benth. BIG 



GALLETA. (Fig. 1006.) 



Plants rather robust at 

 base, branching, the 

 branches mostly erect 

 or ascending, the base 

 rather woody, decum- 

 bent or rhizomatous ; 

 culms numerous, rigid, 

 f elty-pubescent, g 1 a b - 

 rate and scabrous above, 

 50 to 100 cm tall; leaves 

 felty or glabrous, usu- 

 ally woolly at the top 

 of the sheath; blades 

 spreading, 2 to 5 cm 

 long, or longer on sterile 

 shoots, 2 to 4 mm wide, more or less involute, acuminate into a rigid 

 coriaceous point ; group of spikelets about 8 mm long, densely bearded 

 at base; glumes of lateral spikelets thin, long-ciliate, about 7-nerved, 

 usually 2- to 4-lobed at the broad summit and with 1 to 3 nerves 

 excurrent into slender awns, nerves sometimes obscure and scarcely 



FIGURE 1006. Plilaria rigida, X 1. (Palmer 494, Utah.) 



