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Euphorbia stictospora, Engelm. Narrow-seeded Spurge. 

 Common in dry soils from the Missouri valley west- 

 ward. 



Euphorbia nutans, Lag. Upright Spotted Spurge. 

 Etiphorbia preslii^ Guss. 



In the Sioux, James and Missouri valleys, especially 

 the eastern part. 



Euphorbia hexagona, Nutt. Angled Spurge. 



In dry soils from the Missouri valley westward. 



EviphorT)ia niarginata, Pursh. White Margined Spurge. 

 Along the Missouri river in the southern part of the 

 state and thence westward. 



Euphorbia dentata, Michx. Toothed Spurge. 



In the southern part of the Missouri valley, Charles 

 Mix county, and in the Black Hills. 



Euphorbia heterophylla, L. Various-leaved Spurge. 



In the southern part of the Sioux and Missouri val- 

 leys; near Sioux Falls, Yankton and Running Water. 



Euphorbia dictyospornia, F. & M. Reticulate-seeded 

 Spurge. 



In the James valley near Aberdeen, and from thence 

 westward. 



Euphorbia robusta, (Engelm.) Small. Rocky Mountain 

 Spurge. 

 Euphorbia mountain robusta^ Engelm. 



Along the Cheyenne river and in the Black Hills; 

 probably ranging from the Missouri valley westward. 



Callitrichace^. — Water Starwort Family. 



Callitriche palustris, L. Water Fennel. 



Common in clear, cold streams throughout the state. 



Callitriche bifida, (L.) Morong. Autumnal Starwort. 

 Callitriche aiitiDunalis^ L. 



In running water in the Minnesota and Sioux valleys. 



