210 



WEED FLORA OF IOWA 



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



Description. — Stems stout, high, erect, hairy or smoothish ; annual, 

 from 2-3 ft. high ; leaves sessile ovate-oblong, acute ; uppermost 

 leaves white, petal-like margins. 



The flowering spurge (Euphorbia corollata L.) with white flowers 

 in forked umbels; long peduncles; involucres showy, white append- 

 ages appearing like petals ; deep perennial root ; is common in grav- 

 elly and sandy soils in many parts of the state, and it is often weedy. 



Distribution. — Snow-on-the-mountain occurs from Minnesota to 

 Missouri and Colorado; also reported eastward to Ohio and South 

 Carolina. A frequent escape from gardens in Iowa ; common only 

 in the western part. 





Fig. 122. Snow-on-the-Mountain (Euphorbia marginata). A frequent escape 

 from gardens. a, Whole plant, one-third natural size ; b, seed capsule, 

 natural size. 



