458 



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. 



9 9 



Fig. 318. Seeds of Spotted Spurge {Euphorbia preslii). A and B, different 



views of seed. D. Fruit. E. Seed, natural size. 



(After Hillman, Bull. Mich. AgT. 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 



Figure 319B 



Fig. 319. A. Flowering Spurge (Euphorbia corollata.) 



B. Snow-on-the-Mountain (.Euphorbia marginata). 



(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 flattened at apical end, length 4 mm., width 

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

 marked by a dark longitudinal line. 



