CICEORIACEAE. 311 



Burlington— Bordentown (C). Cape May— Anglesea (Li.). Bunted 

 don— Rosemont, Bull Island at Frenchtown (C). 

 New Castle — Scarce. 



7. Lactuca spicata (Lam.) Hichc. M. p. 899. Low grounds. Summer 

 and fall. 

 Philadelphia— Wissahickon (VP.), Fairmount Park (Wn.). Bucks— 

 Eock Hill (Fr.). Delaware— Near Media (B. Sm.). Chester— (P.). 

 Lancaster— York Furnace (He.). Dauphin— Steelton (Wn,). North- 

 ampton— Easton, Porter (B. C). 

 New Jersey— Frequent. 

 ' New Castle— Common. 



10. CBEPIS L. Hawk's-beakd. 



Stem leaves narrow, revolute-margined', sessile. 1. C. tectorum. 

 Stem leaves lanceolate, clasping, not revolute-margined. 



Involucre 6-8 mm. high; achenes 10-stfiate. 2. C. virens. 



Involucre 8-12 mm. high; achenes 13-striate. 3. C. biennis. 



1. Cebpis tectokum L. M. p. 902. Fields and ballast. Summer. 



Bucks— Sellersville (Fr.). 



2. Ceepis virens L. M. p. 902. Ballast. Summer. 



Northampton — Easton (P.). 

 Camden— Kaighn's Point (Ja.). 



3. Ceepis biennis L. M. p. 902. Waste places. Summer. 



Chester — (P.). Northampton — Easton (P.). 



11. HIEBACIUM^L. Hawkweed. 



Flowering stem leafless or with 1-5 leaves ; achenes columnar or oblong, trun- 

 cate. 

 Stem scapose, with a single head only; principal bracts in 1-3 series; 



introduced. 

 Heads corymbose or paniculate; principal bracts in 1-3 series. 



Leaves mostly entire, spatulate to oblong; heads corymbose; prin- 

 cipal bracts of the involucre in 2-3 series ; introduced. 



2. E. aurantiacum. 

 Leaves, at least some of them, denticulate, mostly obovate or oval; 



heads corymbose-paniculate; principal bracts in 1 series; 

 natives. 

 Stem glabrous or nearly so ; leaves usually purple-veined. 



3. E. venosum. 

 Stem pilose below; leaves green. 4. H. Marianum. 



Flowering stem abundantly leafy, at least below. 



Principal bracts of the involucre in 2-4 series; heads corymbose. 



5. H. Canadense. 

 Principal bracts in 1 series; heads small, paniculate of racemose. 

 Achenes columnar at maturity; truncate. 



Plant nearly or quite glabrous except towards the base; heads 

 15-20-flowered. 6. M. paniculatum. 



Plant scabrous or glandular; heads 15-50-flowered. 



7. E. scabrum. 

 Achenes spindle-shaped or with tapering summit at maturity. 



8. H. Gronovii. 



1. Hiebacium Pilosella L. M. p. 903. Door-yards and fields. Summer. 

 Northampton— Easton (P.). 



