468 



WEED FLORA OF IOWA 



Upright Spurge {Euphorbia preslii Guss.)- 



Seeds lead-colored, obovoid-oblong, with 4 unequal sides ; surface 

 pitted and transversely wrinkled ; a narrow dark raphe along one 

 edge; length 1-1.3 mm. 



Fig. 318. Seeds of' Spotted Spurge (.Ettphorbia preslii). A and B, different 



views of seed. D. Fruit; B. Seed, natural size. 



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



Flowering Spurge (Euphorbia corollata L.)- 



Seeds ovoid, one-tenth in. in length, smooth, brownish, a line 

 extending from apex to base on one side, with whitish bordered 

 depression at base; apical point on larger end; seed coat mucilagin- 

 ous. 



Figure 319A 



Fig. 319. 



B. Snow-on-the-Mountaln (Suphorbia niatginat^) 



Figure 319B 

 A. Flowering Spur§;e (.Euphorbia coroUata.) 



(Drawing by Ada Hayden.) 



Milk Purslane (Euphorbia maculata L.). 



Seeds ovoid or oblong, obtusely angled, one-twentieth in. in 

 length, minutely pitted and transversely wrinkled ; grayish. 



Snow-on-the-mountain (Euphorbia marginata Pursh.). 



Seed ovoid, slightly flatj;ened at apical end, length 4 mm., width 

 3 mm. ; color light brown ; surface roughly tuberculate ; one side 

 marked by la dark longitudinal line. 



