MANUAL OF THE GKASSES OF THE UNITED STATES 



43 



long, the branches slender, drooping; spikelets 2 to 2.5 cm long, 

 coarsely pubescent throughout; lemmas 11 to 12 mm long, the 

 pubescence somewhat dense on the margin; awn 4 to 6 mm long. 

 91 Moist thickets near the coast, southern Alaska to Western 

 Oregon. 



13. Bromus laevipes Shear. (Fig. 20.) Light green or glaucous; 

 culms 50 to 100 cm tall, from a decumbent base, often rooting at the 

 lower nodes; ligule 2 to 3 mm long; 



blades 4 to 7 mm wide; panicles 

 broad, 15 to 20 cm long, the branches 

 slender, drooping; first glume 3- 

 nerved, 6 to 8 mm long, the second 

 5-nerved, 10 to 12 mm long; lemmas 

 obtuse, 7-nerved, 12 to 14 mm long, 

 densely pubescent on the margin 

 nearly to the apex and on the back 

 at base; awn 3 to 5 mm long. 91 

 Moist woods and shady banks, south- 

 ern Washington to California, Nevada 

 (Charleston Mountains), and Arizona 

 (Tanner Canyon). 



14. Bromus vulgaris (Hook.) Shear. 

 (Fig. 21.) Culms slender, 80 to 120 

 cm tall, the nodes pubescent; sheaths 

 pilose; ligule 3 to 5 mm long; blades 

 more or less pilose; panicle 10 to 15 cm 

 long, the branches slender, drooping; 

 spikelets narrow, about 2.5 cm long; 

 glumes narrow; sparsely pubescent, 

 the first acute, 1-nerved, 5 to 8 mm 

 long, the second broader, longer, 



obtuse to acutish, 3-nerved; lemmas 8 to 10 mm long, sparsely pube- 

 scent over the back, more densely near the margin, or nearly glabrous; 

 awn 6 to 8 mm long. 91 Rocky woods and shady ravines, western 

 Montana and Wy? 1 * 1 * 1 ^ to British Columbia and California (fig. 22). 

 Two scarcely distinct robust varieties have been described: B. vul- 

 garis var. eximius Shear, a form with glabrous 

 sheaths and nearly glabrous lemmas, Washington 

 to Mendocino County, Calif.; and B. vulgaris 

 var. robustus Shear, with pilose sheaths and 

 large panicle, British Columbia to Oregon. 



15. Bromus ciliatusL. FRINGED BROME. (Fig. 

 23, A.) Culms slender, 70 to 120 cm tall, 

 glabrous or pubescent at the nodes; sheaths 

 glabrous or the lower short-pilose, mostly shorter 

 than the internodes; blades rather lax, as much as 1 cm wide, sparsely 

 pilose on both surfaces to glabrous; panicle 15 to 25 cm long, open, 

 the branches slender, drooping, as much as 15 cm long; first glume 

 1-nerved, the second 3-nerved; lemmas 10 to 12 mm long, pubescent 

 near the margin on the lower half to three-fourths, glabrous or nearly 

 so on the back; awn 3 to 5 mm long. 91 Moist woods and rocky 

 slopes, Newfoundland to Washington, south to New Jersey, Tennessee, 

 Iowa, western Texas, and southern California (San Bernardino 



FIGURE 21. Bromus vulgaris, X 1. 

 (Chase 4945, Wash.) 



FIGURE 22. Distribution of 

 Bromus vulgaris. 



