50 



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



places and cultivated soil, introduced 

 from Europe, Canada, and Alaska, 

 abundant on the Pacific coast, oc- 

 casional eastward to Nova Scotia 

 and south to North Carolina. This 

 has been referred to B. hordeaceus 

 L., a distinct European species. 





Figuke 30. — Bromus molliforrnis, X 1. (Chase 5564, 

 Calif.) 



31. Bromus molliforrnis Lloyd. 

 (Fig. 30.) Culms erect, mostly 10 to 

 20 cm. tall, sometimes taller; lower 

 sheaths felty-pubescent, the upper 

 glabrous; blades narrow, the upper 

 surface with scattered rather stiff 

 hairs; panicle 2 to 4 cm. long, ovoid, 

 dense, few-flowered; spikelets oblong, 

 compressed, 12 to 18 mm. long; 

 glumes about 6 mm. long, the second 

 broader, loosely pilose, the hairs 

 spreading; lemmas thinner and nar- 

 rower than in B. mollis, closely im- 

 bricate, about 8 mm. long, appressed- 

 pilose, the margin whitish; awn from 

 below the entire apex, 5 to 7 mm. 

 long; palea a little shorter than the 

 lemma; anthers 0.4 mm. long, about 

 as broad. O — Open ground, 

 southern California; Texas (College 

 Station) ; introduced from Europe. 



32. Bromus racemosus L. (Fig. 

 31.) Differing from B. mollis in the 

 somewhat more open panicle and 

 glabrous or scabrous lemmas. O 

 (Including what in this country has 

 been called B. hordeaceus glabrescens 

 Shear, B. hordeaceus var. leptostachys 

 Beck, and B. mollis f. leiostachys 



Fernald.) — Weed in waste places, 

 chiefly on the Pacific coast and east 

 to Montana, Colorado, and Arizona; a 

 few points from Wisconsin and Illi- 

 nois to Maine and North Carolina; 

 introduced from Europe. 



Bromus scoparius L. Resembling 

 B. molliforrnis; culms 20 to 30 cm. 

 tall; sheaths soft-pubescent; blades 

 glabrous, scabrous or sparingly pilose; 

 panicle contracted, erect, 3 to 7 cm. 

 long; spikelets about 1.5 cm. long, 3 

 to 4 mm. wide; lemmas about 7 mm. 

 long, narrow, glabrous; awn 5 to 8 

 mm. long, finally divaricate. O — 

 Introduced from Europe in California 

 (Mariposa), Virginia (Newport News, 

 on ballast), and Michigan (School- 

 craft). 



Bromus macrostachys Desf. An- 

 nual; culms erect, 30 to 60 cm. tall; 

 panicle narrow, compact, consisting 

 of a few large coarsely pilose, awned 

 spikelets about 3 cm. long. O — 

 Wool waste, Yonkers, N. Y., and 

 College Station, Tex. Sometimes cul- 

 tivated for ornament. Mediterranean 

 region. 



Figure 31. — Bromus racemosus, X 5. 

 (Hitchcock 2667, Calif.) 



33. Bromus squarrosus L. (Fig. 



32.) Culms mostly 20 to 30 cm. tall, 

 erect; sheaths and blades softly and 

 densely pubescent; blades 5 to 15 cm. 

 long, 2 to 4 mm. wide, usually erect; 

 panicles nodding, the relatively 

 coarse, short branches subverticillate, 

 flexuous, bearing 1 or 2 large spike- 

 lets; spikelet about 2 cm. long, 5 to 8 

 mm. wide, somewhat inflated; awns 



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