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



long, the glumes "about half as long, 

 ovate; lemma lanceolate, acute, mu- 

 cronate. % — Dry or moist open 

 often alkaline soil, New Brunswick 

 and Maine to Alberta, south to Michi- 

 gan and Nebraska and in the moun- 

 tains to New Mexico, through eastern 

 Washington to California and Ari- 

 zona; Baja California. There are two 

 intergrading forms of this species; one 

 with rather stout decumbent or 

 somewhat spreading culms (M . squar- 

 rosa (Trin.) Rydb.), the other with 

 slender erect culms (M . richardsonis 

 (Trin.) Rydb.). 



17. Muhlenbergia villosa Swallen. 

 (Fig. 536.) Culms 10 to 20 cm. tall, 

 Aviry, freely branching, erect from 

 creeping rhizomes, puberulent, ob- 

 scurely nodulose; blades 2.5 to 3.5 

 cm. long, firm, involute, glabrous be- 

 neath, pubescent above; panicles 2 to 

 4 cm. long, the branches appressed or 

 spreading, closely flowered; spikelets 

 2 to 2.5 mm. long, appressed; glumes 

 subequal, 1 to 1.6 mm. long, acute or 





Figure 533. — Muhlenbergia repens. Plant, X 1; 

 glumes and floret, X 10. (Silveus 831, Tex.) 



sometimes less than half as long as 

 the paler lemma. 01 (Sporobolus 

 utilis Scribn.) — Wet places, marshy 

 soil, and along ditches and streams, 

 Texas, southern California, Nevada, 

 and Mexico. Used for stuffing pack 

 saddles. 



16. Muhlenbergia richardsonis 

 (Trin.) Rydb. Matmuhly. (Fig. 535.) 

 Perennial from numerous hard creep- 

 ing rhizomes; culms wiry, nodulose- 

 roughened, erect or decumbent at 

 base, from 5 to 60 cm. tall; ligule 2 

 to 3 mm. long; blades usually in- 

 volute, 1 to 5 cm. long, rarely longer; 

 panicle narrow, interrupted, or some- 

 times rather close and spikelike, 2 to 

 10 cm. long; spikelets 2 to 3 mm. 



Figure 534. — Muhlenbergia utilis. Plant, X 1 ; glumes 

 and floret, X 10. (Lindheimer 559, Tex.) 



