CALLITRICHACEAE. 213 



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



soil. Summer. 

 Bucks — Tullytown, Hilltown, Noekamixon (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. Rich or sandy soil. Spring to faU. 



6. EtrPHORBiA 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 Ipecacuanhae L. M. p. 594. Sandy soil. Spring to fall. 



BucTcs—Venvi Valley (Cr.). 

 New Jersey — Common. 



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



Bucfcs— Near Sellersville (Fr.). Delaware— ConcorA (W. Tr.). Ches- 

 ter— {V.). Lancaster— {'P.). Northampton— (F.). 



Monmouth — Keyport (C). Hunterdon — Rosemont (C). 

 New Castle — Centerville, Commons; Bear. 



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



Chester — Coatesville, H. E. Stone (B. C). Lancaster— (F.). 



Salem — Woodstown. 



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



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



Cam den — Kaighn 's Point ( Ja. ) . 



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



Philadelphia— Gxraxdi Point (Te.). DeZowore— Lansdowne, Br. Emily 

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

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



Camde7i— Camden, I. Burk (He.). 1/^ercer— Trenton (C). 



New Castle — Gardens, Wilmington, Canby. 



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



slopes. Spring and summer. 

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



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



mer. 



Euphorbia segetalis L. Ballast. 



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



Family 9. CALLITRICHACEAE Liiidl. Water-starwort Family. 

 1. CALLITRICHE L. Water- starwort. 



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



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

 Bracts present. 



