EUPHORBIACEAE 425 



Herbage pubescent or puberulent. 



Capsules glabrous. 3. C. Rafinesqui. 



Capsules pubescent. 4. C. maculata. 



Leaves serrate or dentate; plant erect. 5. C. Prcslii. 



i. C. polygonifolia (L.) Small {Euphorbia polygonifolia L.). In 

 sand, along Atlantic coast: N. S. to Fla. and on the shores 

 of the Great Lakes. 



Common on beaches throughout our range, not reported else- 

 where. 



2. C. glyptosperma (Engelm.) Small. In sandy soil: Ont. to B. 



Col., N. Y., Tex. and Mex. 



Known in our area only as a weed, collected many years ago on 

 Fisher's Island in L. I. Sound, and more recently at Hewlett, L. I. 



3. C. Rafinesqui (Greene) Small (E. hirsuta (Torr.) Wiegand). 



In sandy or gravelly soil: Que. and Ont. to Conn., N. Y. 

 and Pa. 



Common, throughout the area, except on the coastal plain. 



4. C. maculata (L.) Small. Fields and roadsides: throughout 



N. Am. 

 Common, often as a troublesome weed, nearly everywhere. 



5. C. Preslii (Guss.) Arthur (E. nutans of American authors. 



Not of Lag.). In fields and thickets: E. N. Am. 



Common throughout the area as a weed except in and near the 

 pine barrens, there rare or wanting. 



Chamaesyce humistrata (Engelm.) Small is erroneously recorded as found many 

 years ago at Brigantine Beach, Atlantic Co., N. J. 



C. serpens (H. B. K.) Small has been found as a waif about cities, as also C. hirla 

 (L.) Millsp. (Euphorbia pilulifera L.), on Staten Island. 



6. Dichrophyllum Kl. & Garcke 



1. D. marginatum (Pursh) KI. & Garcke. (Euphorbia marginata 

 Pursh). In waste places: Central and Atlantic States. 

 Introduced from the West. 

 Very rare as an escape. 



7. Tithymalopsis Kl. & Garcke 



Involucres with conspicuous white petaloid appendages. 1. T. corollala. 



Involucres with inconspicuous green appendages. 2. T. Ipecacuanhae. 



