644 



EUPHORBIACEAE 



Euphorbia 



o ~^ 50 



Map 1334 



Euphorbia vermiculata Ra 



0" ^50 

 Map 1335 



Euphorbia supina Raf 



50 



Map 1336 



Euphorbia corollata L. 



7. Euphorbia vermiculata Raf. {Euphorbia hirsuta (Torr.) Wieg., 

 Euphorbia Rafinesquii Greene, and Chamaesyce Rafinesquii (Greene) 

 Small.) Map 1334. My only specimen was collected 5 miles northeast of 

 Angola in Steuben County along a roadside just west of a crossroad where 

 there is a small pond at the southwest intersection. Nieuwland collected 

 it in 1910 in South Bend, St. Joseph County. 



Eastern Que. to w. Ont., southw. to N. J., Ohio, and 111. 



8. Euphorbia supina Raf. (Contr. Gray Herb. 127: 76. 1939.) (Eu- 

 phorbia maculata of authors and Chamaesyce maculata (L.) Small.) 

 Map 1335. A frequent weed in both moist and dry soils in all parts of the 

 state. Mostly in fallow fields and cultivated grounds; also along road- 

 sides and railroads, in pastures and open woodland, and on the banks of 

 streams. 



N. E., Ont. to Wyo., southw. to Fla. and Tex.; introd. west of the 

 Rocky Mts. 



9. Euphorbia corollata L. (T 'ithymalop sis corollata (L.) Kl. & Garcke.) 

 Flowering Spurge. Map 1336. Infrequent but well distributed throughout 

 the state, being more common in the lake and prairie areas. It prefers a 

 dry sandy soil and is very rarely found in wet situations. It is found in 

 open woodland and fallow fields and along roadsides and railroads. This 

 species varies much as to pubescence and the width of the leaves which 

 has induced authors to assign names to these variations. It is a perennial 

 with a stout rootstock. It is frequently mowed off and killed above the 

 ground by burning, especially along railroads. I have one specimen that 

 has been repeatedly top-killed by burning; it has the crown of the root- 

 stock much thickened and bearing many short pubescent stems. Plants 

 that grow in very dry, exposed habitats or in very dry sand are usually 

 more pubescent than those that grow in moister or shadier places. 



Mass., Ont. to Minn., southw. to Fla. and Tex. 



10. Euphorbia dentata Michx. (Poinsettia dentata (Michx.) Small in 

 Britton and Brown, Illus. Flora, ed. 2.) Map 1337. Along railroads and 



