MANUAL OF THE GRASSES OF THE UNITED STATES 



37 



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long, naked below for as much as 10 or 15 cm, few-flowered; spikelets 

 2.5 to 3.5 cm long, 6- to 12-flowered, the rachilla joints longer than in 

 B. catharticus, exposed at an thesis; lemmas scabrous, sometimes 

 hirtellous toward base; awn 5 to 10 mm long. Ql — Woods and 

 banks near the coast, Washington to Alaska. 



3. Bromus aleutensis Trin. (Fig. 8.) Culms rather stout, erect 

 from a usually decumbent base, 50 to 100 cm tall; sheaths sparsely 

 retrorse-pilose or glabrous; blades sparsely pilose, 5 

 to 10 mm wide; panicle erect, loose, 10 to 20 cm long, 

 the branches rather stiffly ascending, bearing 1 or 2 

 (rarely 3) spikelets, the lower as much as 10 cm long; 

 spikelets 2.5 to 3.5 cm long, 3- to 6-flowered; glumes 

 subequal, the first 3-nerved, the second 5- or indis- 

 tinctly 7-nerved ; 

 lemmas broadly 

 lanceolate, 7- 

 nerved, scarious- 

 margined, smooth 

 to scabrous-pu- 

 bescent, about 15 

 mm long ; awn 

 mostly about 1 

 cm long. Ql — 

 Open ground, 

 Aleutian Islands 

 to the Olympic 

 Mountain region. 

 4. Bromus bre- 

 viaristatus Buckl. 

 (Fig. 9.) Erect 

 tufted perennial; 

 culms 25 to 50 cm 

 tall; sheaths ca- 

 nescent to dense- 

 ly retrorse-pilose ; 

 blades narrow, be- 

 coming involute, 

 canescent and 



also pilose with spreading hairs, mostly erect or ascending, often only 



1 to 2 mm wide; panicle narrow, erect, 5 to 15 

 cm long, the branches short, appressed, often 

 bearing on!} 7 " one spikelet; spikelets 2 to 3 cm 

 long; lemmas appressed-puberulent; awn 3 to 

 10 mm long. Ql (B. subvelutinus Shear.) — 

 Dry wooded hills and meadows, Wyoming to 

 eastern Washington, California, and Arizona 

 (fig. 10). 

 5. Bromus carinatus Hook, and Arn. Cali- 

 fornia brome. (Fig. 11.) Erect annual or biennial; culms 50 to 100 

 cm tall ; sheaths retro rsely pilose to nearly glabrous ; blades flat, sparsely 

 pilose or nearly glabrous, mostly 3 to 8 mm wide ; panicle as much as 20 

 cm long with spreading, often deflexed, branches, in small plants reduced 



\ ■ ■ 



r 



Figure 8. — Bromus aleutensis, X 1. 

 Alaska.) 



(Evans 550, 



Figure 9.— Bromus 

 breviaristatus. Plant, 

 X H; spikelet. X 5. 

 (Nuttall, Rocky Mis.) 



Figure 10.— Distribution of 

 Bromus breviaristatus. 



