456^ 



WEED FLORA OF IOWA 



LINAOEAE, PliAX FAMILY. 



, Common Vlax {Lmum u$itatissimum Jj-} . ''. 



Seeds ovate, flattened; one-fifth in. long, one-tenth in. wide, basal 

 end curved on one side ; color brown, margins with whitish luster, 



Figure S15A Figure 315B 



Fig. 315. Common Flax (Liniim usitatissimum) . A, seed. B, cross section 



of seed. 

 (A, drawing by Ada Hayden; B, after Winton.) 



smooth, shining ; scar on one ' side, near lower end, small, incon- 

 spicuous; embryo, large, straight. 



OXALIDACEAE, SORREL FAMILY. 



Lady's Sorrel {Oxalis comiculata L.). 



Pod prismatic, cylindrical, seeds 1 mm. in length; shape and 

 markings similar to preceding. 



Oxalis {Oxalis stricta L.). 



Pod angled, awl-shaped ; seeds 1 mm. in length, elliptical, pointed 

 at one end; surface marked by broken transverse lines of white; 

 seed longitudinally ribbed, slightly flattened. 



