THE GENERAL CHARACTERS OF SEEDS 423 



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Figure 256D 



d f 



w 



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, empty 



glume attached to axis of spikelet. 

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

 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 temulenUim) . 



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 jubatum 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. 



