36 



mostly 

 mostly 



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



3 to 10 mm. wide; panicle 

 15 to 30 cm. long, with spread- 



ing or drooping branches, in small 

 plants much reduced; spikelets (ex- 

 cluding awns) 2 to 3 cm. long, mostly 

 6- to 10-flowered, the florets in anthe- 

 sis not or scarcely overlapping, 

 exposing the relatively long rachilla 

 joints; glumes acuminate, the first 6 

 to 9 mm., the second 10 to 15 mm., 

 long; lemmas minutely appressed- 

 pubescent to glabrous, about 2 to 2.5 

 mm. wide as folded, 10 to 20 mm. 

 long; awn 7 to 15 mm. long; palea 

 acuminate, nearly as long as the 

 lemma, the teeth short-awned. O 

 — Open ground, open woods, and 

 waste places, at low and middle alti- 

 tudes, common on the Pacific coast, 

 British Columbia to Idaho and Cali- 

 fornia; New Mexico and Baja Cali- 

 fornia. The species is extremely 

 variable in size, in shape of panicle, 

 and in pubescence, and intergrades 

 freely with the following. 8 



6. Bromus arizonicus (Shear) Steb- 

 bins. Annual, similar to the preceding, 

 commonly shorter; panicle mostly 



Figuee 6. — Bromus breviaristatus. Plant, X Yi\ spike- 

 let, X 5. (Nuttall, Rocky Mts.) 



8 For variability in Bromus carinatus see Harlan. 

 J. R., Amer. Jour. Bot. 32: 142. 1945. For proposed 

 varieties see Shear, C. L., U. S. Dept. Agr., Div. 

 Agrost. Bui. 23. 1900. See also Stebbixs, G. L., 

 Tobgy, H. A., and Harlan, J. R., Calif. Acad. Sci. 

 Proc. 25: 307-321. 1944. 



Figure 7. — Bromus carinatus, X 1. (Hitchcock 2704, Calif.) 



