COMPOSITAE 339 



to Fla., Mo., and Kans. Rare or absent near the coast. — Pennsylvania : 

 Bucks ; Chester ; Northampton ; Huntingdon ; Erie ; Ai^legheny. 



49. SYNOSMA Raf. 

 1. Synosma suaveolens (L. )Raf. Sweet-scenTEd Indian Plan- 

 Tain. (Man. p. 1024; I. F. / ^oj2.) In woods, Conn., and N. J. to 

 111. and Minn., south to Fla., W. Va. and Ky. — Pennsylvania : Lancas- 

 ter ; York ; Fayette ; Allegheny. 



50. SENECIO L. 



Heads conspicuously radiate (with individual exceptions in S. obovatus and 

 S. aureus). 

 Basal and lower cauline leaves with blades narrowed at the base. 

 Blades of the basal and lower cauline leaves predominantlj' spatulate or 



obovate. i. 5. obovahis. 



Blades of the basal and lower cauline leaves predominantly oblong- or 

 elliptic. 

 Blades of some of the basal and lower cauline leaves pinnatifid. 



2. 5'. Bahamitae. 

 Blades of all the basal and lower cauline leaves merely toothed. 



3. .S. Crawfordii. 

 Basal and lower cauline leaves with cordate or subcordate blades. 



4. 5". aureus. 

 Heads discoid or essentially so, the ray-flowers wanting or obsolete. 



Plant glabrous or merely puberulent : achenes canescent. 

 Involucre fully 4 mm. thick, with several scales at the base. 



5. 5". vulgaris. 

 Involucre less than 4 mm. thick, almost without scales at the base. 



6. 5". sylvaticus. 

 Plant viscid-pubescent : achenes glabrous. 7. 5". viscosus. 



1. Senecio obovatus Muhl. Round-leaf Squaw-weed. (Man. p. 

 1027 ; I. F. /". ^041. ) In moist soil and on banks, N. S. to Fla., west to Ont., 

 Mich., Ky. and Mo. — Pennsylvania : Northampton ; Bucks ; Franklin. 



la. S. obovatus elongatus ( Pursh ) Britton. ( Man. p. 1027. ) — North- 

 ampton, Easton. 



2. Senecio Balsamitae Muhl. Balsam Groundsel. (Man. p. 1027 ; 

 I. F. y. 404s.) In dry or rocky soil, N. S. to N. C, west to Wash., B. C, 

 Tex. and Neb. — Pennsylvania: Monroe; Northampton; Bucks; 

 Montgomery; Delaware; Chester; Allegheny. 



3. Senecio Crawfordii Britton. Crawford's Squaw- weed. (Man. 

 p. 1027.) Eastern Pa. — Pennsylvania: Bucks, Tullytown. 



4. Senecio aureus L. Golden Ragwort. (Man. p. 1028 ; I. F. /] 

 4047.) In swamps and wet meadows, Newf. to Fla., west to Ont., Mo. 

 and Tex. — Pennsylvania : Throughout the State. 



4a. S. aureus gracilis (Pursh) Britton. (Man. p. 1028. ) In wet soil, R. 

 I. to Mich., S. Dak., Va. and Mo.— -Bucks ; Lancaster; Northampton. 



5. Senecio vulgaris L. Common Groundsel. (Man. p. 1029; I. F. 

 /• 4053- ) In cultivated ground and waste places, Newf. and Hudson Bay 



