COMPOSITAE. 343 



52. SENECIO L. Groundsel. Squawweed. 



Heads conspicuously radiate (except in forms of 2 and 5). 



At least the lowest leaves entire or dentate, not pinnatifid. 

 None of the leaves cordate. 



Leaves and stems persistently more or less tomentose or vroolly. 



1. S. tomentosus. 

 Leaves glabrous or neai'ly so ; stem often woolly, especially 



below. 

 Basal leaves obovate, spatulate or oval ; achenes glabrous. 

 Basal leaves obovate or suborbicular, crenate or den- 

 tate; involucral bracts 4-5 mm. long. 



2. S. obovatus. 

 Basal leaves ovate to oval; involucral bracts 6-10 mm. 



long. 3. S. Crmvfordii. 



Basal leaves oblong ; achenes glabrous or hispidulous. 



4. S. Balsamitae. 

 Basal leaves cordate or subcordate ; plants mostly glabrous. 



.5. S. aureus. 

 Leaves all pinnatifid or coarsely sinuate-dentate ; plants glabrous, or 

 somewhat woolly when young. 6. S. Jacobea. 



Heads discoid, the rays none, or minute ; introduced species. 



7. S. vulgaris. 



1. Senecio tomentosus Michx. M. p. 1026. Moist soil. Spring. 



Cape Ma?/ — Oceanview (C), Woodbine (Br.), Cape May (Cr.), Sea 

 Isle, I. Burk (He.). ^i?a«tic— Landisville (C), near Egg Harbor (Wn.). 



New Castle— 'Near A. Deakynes ', Blackbird Head, TatnalJ and Com- 

 mons. 



2. Senecio obovatus Muhl. M. p. l027. Open grounds. Spring. 



Buclcs — Springfield (Fr.), Nockamixon (He.) (Ws.). Northampton — 

 Easton, Porter (B. C). 



Camden— JtiYer Swamp (C). 

 2a. Senecio obovatus elongatus (Pursh.) Britton. M. p. 1027. Open 

 grounds. Spring. 

 Northampton — Easton (P.). 



3. Senecio Crawfordii Britton. M. p. 1027. Moist soil. Spring. 



Bucks— TuWytown (Cr.). 



Camde?! — Springdale (St.). Mercer— Near Lawrence Station. 



4. Senecio Balsamitae Muhl. Golden Bagwort. M. p. 1027. Dry or rocky 



soil. Early summer. 



Buclcs— 'Esst of Wheatsheaf, Nockamixon (Cr.), Perkasie (Fr.), Rock 

 Hill, Dr. J. B. Brinton (He.). Montgomery— Ivy Rock (-Ta.) (Ke.), 

 Lafayette (Ja.) (Ke.). Delaivare— Near Media (Fu.), Williamson (Le.), 

 Swarthmore (Ws.). C/iesier — Phoenixville, Mart. (B. C), Westtown 

 (Le.), Uniontown (St.), French Creek (Sts.). Northampton — {V.). 



Neiv CasfZe— Serpentine banks. Scarce. 



5. Senecio aureus L. Golden Ilagrcort. M. p. 1028. Moist soil. Early 



summer. 



6. Senecio Jacobea L. M. p. 1029. Ballast. Summer. 



Camden — Kaighn 's Point (He.) (Ja.). 



7. Senecio vulgaris L. Common Groundsel. M. p. 1029. Waste ground. 



Spring to fall. 



