THE GENERAL CHARACTERS OP SEEDS 423 





%^Mi1 iiv/. A/ 



4 



-4- 



Figure 256D 



Fig. 256. D. Western Wheat Grass (.Agropyron smithii) ; a, large spikelet ; 



b and d, small spikelet ; c, edge view of spikelet ; e, empty glumes ; f , empt y 



glume attached to axis of spikelet. 

 (After Hillman. A, Cir. U. S. Dept. Agr. ; B. Bull. Mich. Agr. Exp. Sta. ; C. 

 Cir. U. S. Dept. Agr.; D, Cir. U. S. Dept. Agr.) 



ened, granular-serrate on margins, finely pubescent at apex ; 

 rachilla prominent, hairy, minutely roughened. Occasionally oc- 

 curs in clovers. 



Western Wheat Grass {Agropyron smithii Rydb.). 



Fruit similar in shape and size to A. repens, but the broadest 

 portion nearer the tip, giving it more of the characteristic outline 

 of brome grass; tip generally awned, surface finely pubescent; 

 toothing on edge of palea seems finer than in A. repens. 



Poison Darnel (Lolium temulentum) . 



Flowering glume about three-tenths in. long, awned or awnless, 

 smooth, obscurely nerved; margins folded in over the palet; tur- 

 gid ; shorter than in Lolium perenne. 



Wild Barley (Hordeum juba-tum L.). 



Spikes narrow, 1-3 in. or more long; empty glumes rigid; the 4 

 internal ones of each group dilated above the base, those of central 

 sublanceolate, all awn-pointed; outer glumes of lateral spikelets 

 setaceous; flowering glume of central spikelet awned; florets of 

 lateral spikelets awnless. 



