COMPOSITAE 329 



TON ; Bucks ; Delaware ; Chester ; Lancaster ; Luzerne ; York ; 

 Schuylkill ; Huntingdon ; Franklin ; Blair ; Allegheny. 



4. Gnaphalium purpureum L. Purplish Cudweed. (Man. p. 978 ; 

 I. F. /. 38sg.) In dry sandy soil, eastern Me. to Fla., west to Pa., W. 

 Va., Ky., Kans., Tex. and Hex. Also on the Pacific coast and in S. 

 A.m.— Pennsylvania : Northampton ; Bucks ; Delaware ; Chester ; 

 Lancaster ; Luzerne ; Franklin ; Blair ; Allegheny. 



24. INULA L. 

 1. Inula Helenium L. Elecampane. (Man. p. 979 ; I. F. / 3861.) 

 On roadsides and in fields, N. S. to Ont. and Minn., south to N. C. 

 and Mo. Nat. from Eu. — Pennsylvania: Monroe ; Northampton; 

 Bucks ; Delaware ; Chester ; Lancaster ; Somerset ; Erie ; 

 Allegheny. 



25. POLYMNIA L. 



Ligules of the ray-flowers linear or oblong-linear ; achenes striate. 



1. P. Uvedalia, 

 Ligules of the ray-flowers flabellate, often very small : achenes 3.ribbed. 



2. P. Canadensis, 



1. Polymnia Uvedalia L. Large-FLOWERED Leaf-cup. (Man. p. 

 979 ; L F. /. 3862.) In rich woods, N. Y. to Ind. and Mich., Fla., Mo. 

 and Tex. — Pennsylvania : Northampton ; Delaware ; Chester ; 

 Berks ; Franklin ; Huntingdon ; Allegheny. 



2. Foljrmnia Canadensis L. Small-FlowerED Leaf-cup. (Man. 

 p. 980; I. P./". 3863.) In damp, rich shaded places, western Out. to 

 Minn., Ga., Mo. and Ark. — Pennsylvania: Chester; Lancaster; 

 York ; Allegheny. 



26. SILPHIUM L. 

 Leaf-blades entire or merely toothed. 



Disk about 1.5 cm. wide during anthesis ; leaves connate-perfoliate, merely 

 opposite. I. 5. perfoliaium. 



Disk about i cm. wide during anthesis : leaves not connate, usually in whorls 

 of 3 or 4. ,; 2. 5". trifoliatum. 



Leaf-blades pinnatifid or bipinnatifid. 3. 5. laciniatum. 



1. Silphium perfoliatum L. Cup-planT. (Man. p. 981; I. F. /. 

 386^.) In moist soil, southern Ont. to S. Dak., south to Ga., Neb. and 

 La. Nat. eastward. — Pennsylvania : Philadelphia ; Cumberland. 



2. Silphium trifoliatum L. WhorlEd Rosin- weed. (Man. p. 981; 

 I. v. f. 386/.) In woods, Pa. to Ohio, Va. and Ala. — Pennsylvania: 

 Lancaster, Tucquan ; Huntingdon ; Clarion ; Elk ; Allegheny ; 

 Fayette. 



3. Silphium laciniatum L. Compass-plant. Pilot- weed. (Man. 

 p. 981 ; I. F. _/! 3869.) On prairies, Pa. to S. Dak., Ala., La., Kans. and 

 Tex. — Pennsylvania : Allegheny. 



27. CHRYSOG-ONUM L 

 1. Chrysogonum Virginianum L. Chrysogonum. (Man. p. 982 ; 

 I. F. /. 3871. ) In dry soil, southern Pa. to Fla. — Pennsylvania . LAN- 

 CASTER ; Franklin. 



