38 



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



Schrad.) — Occasionally cultivated for orna- 

 ment; Mexico. 



riox 2. Bro.m6psis Dum. 



Perennials; panicles mostly open; 

 spikelets rather elongate, sub- 

 terete or slightly compressed be- 

 fore flowering; florets closely 

 overlapping. 

 10. Bromus inermis Leyss. Smooth 

 brome. (Fig. 10.) Culms erect, 50 to 

 100 cm. tall, from creeping rhizomes; 

 ligule 1.5 to 2 mm. long; blades 

 smooth or nearly so, 5 to 10 mm. 

 wide; panicle 10 to 20 cm. long, erect, 



Figure 10.- 



-Bromus inermis. Plant, X l A; spikelet, 

 X 2]/ 2 . (Deam 11633, Ind.) 



the branches whorled, spreading in 

 flower, contracted at maturity; spike- 

 lets 2 to 2.5 cm. long, subterete be- 

 fore flowering ; first glume -4 to 5 mm. 

 long, the second 6 to 8 mm. long; 

 lemmas 9 to 12 mm. long, glabrous or 

 somewhat scabrous, rarefy villous, 

 obtuse, emarginate, mucronate, or 

 with an awn 1 to 2 mm. long. % 

 — Cultivated as hay and pasture 

 grass, especially from Minnesota and 

 Kansas to Washington and California, 

 occasionally eastward to Michigan 

 and Ohio and south to New Mexico 

 and Arizona, now running wild in 

 these regions; introduced along roads 

 and in waste places in the northern 

 half of the United States ; occasionall}'' 

 southward. Also used for reseeding 

 western mountain ranges. Introduced 

 from Europe. 



11. Bromus pumpellianus Scribn. 

 (Fig. 11.) Resembling B. inermis; 

 culms 50 to 120 cm. tall, from creep- 

 ing rhizomes; sheaths glabrous or 

 pubescent; blades rather short, mostly 

 glabrous beneath, scabrous or some- 

 what pubescent on upper surface; 

 panicle 10 to 20 cm. long, rather nar- 

 row, erect, the branches short, erect, 

 or ascending; spikelets 7- to 11- 

 flowered, 2 to 3 cm. long; first glume 

 1-nerved, the second 3-nerved; lem- 

 mas 10 to 12 mm. long, 5- to 7-nerved, 

 pubescent along the margin and 

 across the back at base, slightly 

 emarginate; awn mostly 2 to 3 mm. 

 long. % — Meadows and grassy 

 slopes, Colorado to the Black Hills of 

 South Dakota, Idaho, and Alaska; in- 

 troduced in Michigan. Bromus pum- 

 pellianus var. tweedyi Scribn. Dif- 

 fering in having lemmas more densely 

 pubescent. 01 — Alberta to Col- 

 orado. 



12. Bromus erectus Huds. Culms 

 tufted, erect, 60 to 90 cm. tall, slen- 

 der; sheaths sparsely pilose or gla- 

 brous; ligule 1.5 mm. long; blades nar- 

 row, sparsely pubescent; panicle 10 

 to 20 cm. long, narrow, erect, the 

 branches ascending or erect; spikelets 

 5- to 10-flowered; glumes acuminate, 

 the first 6 to 8 mm., the second 8 to 



