302 



GRASSES OF IOWA. 



cent; the lower distinctly three or obscurely five-nerved, 3J to 4.^ lines 

 (7-9 mm.) long; the upper five or sometimes obscurely seven-nerved, 4! 

 to 5^ lines (9-1 1 mm.) long; flowering glume lanceolate, obscurely 

 seven-nerved, puberulent or short pubescent, about 6^ to 8 lines (13-16 

 mm. long, bifid at the apex, and tapering into an awn 3^ to 5 lines (7- 

 10 mm.) long; palea nearly equalling its glume, ciliate-pectinate on the 

 keels; rachilla slender, somewhat pubescent, about 1 .', lines ( } m.m) long. 



DISTRIBUTION". 



Iowa. Algona (Watson). This plant appears as a native, though 

 it may have been introduced. If so, it places it far out of its ordinary 

 range. 



North America. Nevada to California, Oregon and Washington. 



Fig. ','12. Bromus carinatus-&, spikelet With 

 empty flumes and 8 flower?; b, flowering glume. (Div. 

 Agros. U. 8. Dept. Agrl.) 



Fig. 213. Bromus secalinus — a, spikelet. (Div. 

 Agros. U. S. Dept. Agr. ) 



