FESTUCEAE 



143 



67. BROMUS I... Bkome Grass. Wild Oats. 



Flowering glumes conipres.sed-carinate at the 

 base. 

 JFlowerlng glumes appressed-villous. 

 bhcaths more or less villous. 

 Sheaths and leaves glabrous or nearly so. 



Flowering glumes smooth or scabrous. 

 Leaves and sheaths noticeably pubescent; 

 annual. 



Leaves not pubescent, sheath.s sometimes 

 slirfhtly so; perennial. 

 Le;i\fs narrow, awns short. 

 Leaves broader, awns longer. 



Flowering glumes not compressed-carinate but 

 rounded on the back at least at the base. 

 Flowering glumes glabrous or scabrous. 

 Sheaths pubescent. 



Panicle dense, contracted; plant low. 



Panicle loose, more or less spreading; 

 plant taller. 

 Sheaths glabrous. 



Spikelets laterally compressed, ovate-lan- 

 ceolate. 

 Spikelets terete long and narrow. 

 Flowering glumes appressed villous at least 

 near the base. 

 Pubescence une(iually distribulcd over the 

 back of the Ilowering glume, densest be- 

 low and on the margin. 

 Pubescence about equally distributed over 

 the back of the flowering glume. 

 Sheaths densely pilose-pubescent. 

 Sheaths never densely pilose, cccasionally 

 slightly hairy in B. portcri. 



Lower empty glume 3-nerve<i. 

 Lower empty glume 1-nerved. 



1. B. marginatus latior. 



2. B. marginatus semi' 

 nudus. 



3. B. unioloides. 



4. B. polyanthus. 



5. B. polyanthus pani' 



cidatxis. 



6. B. hordeaceus 

 glabrcscens. 



7. /?. raccmosus. 



8. B. ficcalimis. 



9. B. i Iter mis. 



10. B. richardsonii. 



11. /}. lanatipes. 



12. B. porteri. 



13. B. frondosus. 



BromUS CiliatUS is reported from several different localities 

 but tlie citations probably rest on incorrect determinations. 



1. BromuS marginatus latior Shear. From the mountains 

 of the southwestern part of the State in the Upper Sonoran and 

 Transition Zones. 



2. BromuS marginatus seminudUS shear. Occurs in the 

 mountains of the southern part of the State mostly in the Tran- 

 sition Zone. 



3. Bromus unioloides 11. B. K. Brome Grass of the seeds- 

 men. This species has osca] ed oteisively along the ditches on the 



