424 



WEED FLORA OF IOWA 



Figure 257a 



A 8 



Figure 267B 



Figure 2570 



Fio. 257. A. Seed of Darnel (.LoUum temulentum) . a, b, with awns enlarged, 



c, natural size. 

 B. Wild Barley (.Bordeum juhatum.) C. Little Barley (Hordeum pusillum). 

 ( 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 

 sublaneeolate, 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, 4 mm. 

 in diameter; surface smooth. 



