CALLITBICHACEAE. 213 



2. Euphorbia hirsuta (Torr;) Wiegand. M. p. 592. Sandy or gravelly 



soil. Summer. 

 Bucks — Tullytown, Hilltown, Nookamixon (Fr.). Lancaster — (P.). 

 Northampton— (P.). 



3. Euphorbia maculata L. M. p. 592. Open places and roadsides. Sum- 



mer and fall. 



4. Euphorbia nutans Lag. M. p. 593. Fields and thickets. Summer 



and fall. 



5. Euphorbia corollata L. M. p. 593. Bich or sandy soil. Spring to fall. 



6. Euphorbia marginata Pursh. M. p. 594. Escaped from gardens. Sum- 



mer. 



7. Euphorbia dentata Michx. M. p. 594. Dry or moist soil. Summer 



and fall. 

 Lancaster— (P.). 



8. Euphorbia Ipecaouanhae L. M. p. 594. Sandy soil. Spring to falL 



Bucks— Penn Valley (Cr.). 

 New Jersey— Common. 



9. Euphorbia Lathyris L. M. p. 594. Waste places. Summer. 



Bucks— Near Sellersville (Fr.). Delaware— Concord (W. Tr.). Ches- 

 ter— ( P. ) . Lancaster — ( P. ) . Northampton — ( P. ) . 



Monmouth — Keyport (C). Bunterdon — Bosemont (C). 

 New Cast Je— Centerville, Commons; Bear. 



10. Euphorbia Darungtonh A. Gray. M. p. 594. Copses. Summer. 



Cheste r— Coates ville, H. E. Stonp (B. C.). Lancaster— (P,) . 



Salem— Woodstown. 



New Castle— South of New Garden, Joshua Hoopes; Southwood,/Conby. 



11. Euphorbia Helioscopia L. M. p. 595. Ballast. Summer and fall. 



Camden— Kaighn's Point (Ja.). 



12. Euphorbia Peplus L. M. p. 595. Waste places. Summer. 



Philadelphia— Girard Point (Te.). Delaware— -Lansdowne, Dr. Emily 

 O. Hunt (He.) (Pe.). Chester— West Chester, Dr. Geo. Martin (Fu.). 

 Lancaster— (P.). Northampton— Streets of Easton (P.). 



Camden— Camden, J. Burk (He.). Mercer— Trenton (C), 

 New Castle— Gardens, Wilmington, Canoy. 



13. Euphorbia commutata Engelm. M. p. 595. Along streams and shady 



slopes. Spring and summer. 

 Lancaster— York Furnace (Cr.) (Li.), Safe Harbor (P.). 



14. Euphorbia Cyparissias L. M. p. 596. Escaped from gardens. Sum- 



mer. 

 Euphorbia seqetalis L. Ballast. 



Philadelphia— Philadelphia, C. A. Boice (B. C). 



Family 9. OALLITRIOHACEAE Lindl. Water-starwort Family. 



1. CALLITEICHE L. Water-starwort. 



Fruit short-peduncled; bracts wanting; terrestrial. 1. C. Austini. 



Fruit sessile ; aquatic, or some forms growing in mud. 

 Bracts present. 



