'424 



WEED FLORA OF IOWA 



Figure '2"i7a 



Figure i"i7B 



Figure 'Jo/C 



Fig. 257. A. Seed of Darnel (Lolium temulentum). a, b, with awns enlarged, 



c, natural size. 

 B. Wild Barley (Hordeum jubatum.) C. Little Barley (Hordeum jntsillum). 

 ( A, after Winton ; B, after Hillman, Bull. Mich. Agr. Exp. Sta ; C, drawn by 



C. M. King.) 



Little Barley (Hordeum pusillum Nutt). 



Spikelet 1-3-flowered ; empty glumes rigid, the 4 internal ones 

 of each group dilated above the base, those of the central spikelet 

 sublanceolate, all awn-pointed; outer glumes of the imperfect lat- 

 eral spikelets setaceous; flowering glume of the central spikelet 

 awned, awn equaling those of the empty glumes; florets of the 

 lateral spikelets awnless, or nearly so. 



URTICACEAE, NETTLE FAMILY. 



Hemp (Cannabis sativa L.). 



Achene ovoid, brown with more or less light markings, -A mm. 

 in diameter; surface smooth. 



