434 WEED FLORA OF IOWA 



AMARANTHACEAE, AMARANTH FAMILY. 



Spreading Amaranth (Amaranthus blitoides Wats.). 



Seeds lenticular or round to broadly egg-shaped, one-sixth in. in 

 diameter, both sides convex with distinct margin, glossy, black; 



* j 



Fig. 272. Spreading Amaranth (Amaranthus blitoides) . A, seeds. B, a broken 



specimen. C, an edge view. D, the natural size. 



(After Hillman, Bull. Kev. Agr. Exp. Sta.) 



seeds borne in ovoid-oblong utricle, 2-3-beaked by the persistent 

 style. Reported in western alfalfa seed. 



Tumbleweed (Amaranthus graecizans L.). 



Seeds lenticular or roundish, one-twenty-fourth in. in diameter, 

 glossy black, much like the preceding but smaller. In grasses and 

 lawn mixtures. 



Fig. 273. Tumbleweed (Amaranthus graecizans). A, seeds. B, a broken one. 



C, the natural size. 

 (After Hillman, Bull. Xev. Agr. Exp. Sta.) 



Rough Pigweed (Amaranthus retroflexus L.). 



Seeds from one-eighteenth to one-twentieth in. in length; oval, 

 spherical or nearly spherical, both sides convex with a continuous 

 ring on the margin ; scar small ; smooth, black, shining ; seeds much 

 like A. blitoides but somewhat smaller. In seeds of red clover, 

 alsike, and timothy. 



