52 



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



blades pilose; panicle 12 to 20 cm long, broadly pyramidal, diffuse, 

 somewhat drooping, the slender lower branches 3 to 5, all the branches 

 flexuous; glumes rather broad, the first acute, 3-nerved, 4 to 6 mm 

 long, the second obtuse, 5-nerved, 6 to 8 mm long; lemmas broad, 



obtuse, smooth, 7 to 9 mm long, 9-nerved, 

 the marginal pair of nerves faint, the hya- 

 line margin obtusely angled above the mid- 

 dle, the apex emarginate; awn 8 to 10 mm 

 long, somewhat twisted and strongly flexu- 

 ous at maturity, those of the lower florets 

 shorter than the upper; palea 1.5 to 2 mm 

 shorter than the lemma. O (B. patulus 

 Mert. and Koch) — Weed in waste places, 

 Vermont to Washington, south to North Carolina and California (fig. 

 44); widely distributed in the Old World. 



29. Bromus arvensis L. (Fig. 45.) Resembling B. japonicus, 

 foliage downy to subglabrous; spikelets thinner, flatter (less turgid), 



Figure 44.— Distribution of 

 Bromus japonicus. 



Figure 45.— Bromus arvensis, X 1. (Gray, Md.) 



often tinged with purple; awn straight or nearly so in drying; palea 

 as long as the lemma or only slightly shorter. O — Open ground, 

 cultivated soil, rare, eastern Maryland; introduced from Europe. 

 30. Bromus arenarius Labill. Australian chess. (Fig. 46.) 



Figure 46.— Bromus arenarius, X 1. (Pendleton 1459, Calif.) 



Culms slender, 15 to 40 cm tall, sheaths and blades pilose; panicle 

 open, pyramidal, nodding, 8 to 11 (rarely 15) cm long, the spreading 

 branches and pedicels sinuously curved; glumes densely pilose, acute, 

 scarious-margined the first narrower, 3-nerved, 8 mm long, the 



