298 



GRASSES OF IOWA. 



dm.) long, 3 to 6 lines (6-12 mm.) wide. Panicle erect, rather narrow, 

 mostly I- to I foot (l-2 dm.) long; lower branches 2 to 4 inches (5-10 

 cm.), lowest rarely more than 3^ inches (7 cm.) long, and bearing two 



spikelets. Spikelets 1 to 2 inches (2.5-4 cm -) l° n & 2 i to 3 2 unes (5 _ 7 

 mm.) wide, oblong-ovoid to oblong-lanceolate, laterally compressed, 

 somewhat turgid at maturity, mostly seven to nine-flowered, erect or 



Fig. 209. Bromus marginatus— a, spikelet and empty 

 glumes; b, dorsal view of flowering glumes. (Div. Agros. 

 U. S. Dept. Agrl. ) 



ascending, the uppermost subsessile; empty glumes, rather broad, sca- 

 brous to scabrous-pubescent, the lower subacute, three to five nerved, 

 mostly 3! to 4 1 , lines (7-9 mm.) long; the upper broader, obtuse, 4^ to 

 5 1 , lines (9-1 ] mm.) long, five to seven-nerved, the lateral nerves broad; 

 flowering glume subcoriaceous, coarsely pubescent, ovate-lanceolate, 



