MANUAL OF THE GRASSES OF THE UNITED STATES 



53 



mm. long; awn stout, 3.5 to 5 cm. 

 long. O (B. villosus Forsk. not 

 Scop.; B. maximus Desf., not Gilib.) 

 — Common weed in open ground and 

 waste places in the southern half of 

 California, forming dense stands over 

 great areas in the lowlands, occasional 

 north to British Columbia and east to 

 Idaho, Utah, and Arizona; rare in 

 the Eastern States, Maryland, Vir- 

 ginia, Mississippi, Texas, introduced 

 from Mediterranean region. Distin- 

 guished from the other species of the 

 section by the long awns. Bromus 

 rigidus var. gussonei (Pari.) Coss. 

 and Dur. Differing in having more 

 open panicles, the stiff er, more spread- 

 ing lower branches as much as 10 to 



12 cm. long. O — Weed like B. 

 rigidus, growing in similar places, 

 Washington to California, and Ari- 

 zona; more common than the species 

 in mio^dle and northern California. 



38. Bromus sterilis L. (Fig. 37.) 

 Resembling B. rigidus, less robust; 

 culms 50 to 100 cm. tall; sheaths pu- 

 bescent; panicle 10 to 20 cm. long, the 

 branches drooping; spikelets 2.5 to 

 3.5 cm. long, 6- to 10-flowered; glumes 

 lanceolate-subulate, the first about 8 

 mm. long; lemmas 17 to 20 mm. long, 

 scabrous or scabrous-pubescent, the 

 teeth 2 mm. long; awn 2 to 3 cm. 

 long. O — Fields and waste places, 

 introduced in a few localities from 

 British Columbia to California and 



Figure 36.— Bromus rigidus, X 1. (Tracy 4702, Calif.) 



Figure 37. — Bromus sterilis, X 1. (Boettcher 2423, D. C.) 



