MANUAL OF THE GRASSES OF THE UNITED STATES 



37 



stiff, erect and relatively narrow; 

 spikelets mostly 5- to 7-flowered; 

 glumes less unequal, the second often 

 equaling the length of the lowest 

 lemma; lemmas hirsute toward the 

 margin, occasionally sparsely so across 

 the back, the teeth of the apex 0.7 

 to 2 mm. long. O — Open, mostly 

 arid slopes and valleys, western 

 Texas; Arizona to middle California 

 and Baja California. Plants short- 

 lived, flowering in the early spring 

 rains and dying after seeding. 



7. Bromus marginatus Nees. (Fig. 

 8.) Perennial, sheaths mostly con- 

 spicuously retrorsely pilose; blades 

 commonly pubescent, 6 to 12 mm. 

 wide; panicles usually less open than 

 in B. carinatus; spikelets mostly 



Figure 8. — Bromus marginatus, X 1. (Hunter 555, 

 Oreg.) 



closely flowered, lemmas more strong- 

 ly pubescent, awns usually less than 

 7 mm. long. % — Open woods, 

 open or wooded slopes, meadows, and 

 waste places, British Columbia and 

 Alberta to South Dakota, New Mex- 

 ico, and California, mostly on the 

 eastern slope; adventive in Maine (in 

 wool waste); introduced in Illinois, 



Iowa, and Kansas. Variable, inter- 

 grading with B. carinatus and 

 scarcely distinct, though extremes are 

 very different in appearance. 



8. Bromus maritimus (Piper) 

 Hitchc. Perennial; culms stout, 25 to 

 70 cm. tall, geniculate at base with 

 numerous basal shoots; sheaths 

 smooth or scaberulous; blades mostly 

 6 to 8 mm. wide, scabrous; panicle 

 mostly 10 to 20 cm. long, the branches 

 short, erect; spikelets 3 to 4 cm. long. 

 % (B. marginatus maritimus Piper.) 

 • — Near the coast, Lane County, 

 Oreg., to Monterey County, Calif. 



9. Bromus polyanthus Scribn. (Fig. 

 9.) Perennial; culms robust, mostly 90 



Figure 9. — Bromus polyanthus, X 1. (Chase 5349, 

 Colo.) 



to 125 cm. tall; sheaths glabrous; 

 blades 6 to 15 mm. wide, scabrous; 

 panicles commonly 15 to 25 cm. long, 

 the branches ascending; spikelets 

 glabrous or scaberulous, somewhat 

 glossy, rather loose at anthesis; awns 

 4 to 6 mm. long. % — Open or 

 sparsely wooded slopes, foothills, 

 moist ground, Montana to Washing- 

 ton, south to Texas and California 

 (Yosemite National Park); Kansas 

 (experiment station). 



Bromus laciniatus Beal. Tall slender 

 perennial; blades flat; panicles 20 to 30 cm. 

 long, open, drooping; spikelets flattened, 

 about 3 cm. long, mostly purplish; lemmas 

 keeled, awned. % (B. pendulinus Sess6, not 



