HOW TO KNOW THE GRASSES 



83b. Culms with 10 — 20 nodes, the sheaths longer than the intemodes, 

 bearing pointed appendages (auricles) at the throat. Fig. 119. 



Btowms latiglumis (Shear) Hitch. 



Perennial; tufted; culms up to 2 m. tall; pani- 

 20 cles usually 15 — 25 cm. long, rather dense. Leaf 



sheaths longer than the internodes, hence over- 

 lapping. This species blooms several weeks 

 later than B. purgans. These two species fre- 

 quently grow together. The sheaths are often 

 covered with dense grayish wool. Alluvial 

 bottomlands; prairies. July — September. 



Figure 1 19 



84a. Panicle open, pyramid-shaped, erect or drooping 85 



84b. Panicle dense, ovoid, erect, with short branches and overlapping 

 spikelets 90 



85a. Lemmas glabrous or scabrous 86 



85b. Lemmas heavily pubescent 89 



86a. Lemmas bearing awns, not broad or inflated 87 



86b. Lemmas awnless or with minute own tips, very broad and in- 

 flated. Fig. 120. 



RATTLESNAKE CHESS Bromus brizaeiormis F. & M. 



■2D 



Annual; tufted; plants 3(!) — 60 cm. tall; panicles 

 drooping, 5 — 15 cm. long. The odd, inflated spike- 

 lets of this species look much like the rattlers of a 

 rattlesnake. It is sometimes planted for ornament 

 and is occasionally found naturalized in fields and 

 waste ground in the western states and elsewhere. 

 Introduced from Europe. June — August. 



Figure 120 



63 



