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. f. 3S^g.) In dry sandy soil, eastern Me. to Fla., west to Pa., W. 

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

 Am. — Pennsylvania : Northampton ; Bucks ; Delaware ; Chester ; 

 Lancaster ; Luzerne ; Franklin ; Blair ; Allegheny. 



24. INULA L. 

 1. Inula Helenium L. Elecampane. (Man. p. 979 ; I. F. / 3S61.) 

 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. Polymnla Uvedalia L. Large-FlowerED LEaF-cup. (Man. p. 

 979; I. V. f. 3S62.) In rich woods, N. Y. to Ind. and Mich., Fla., Mo. 

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

 Berks ; Franklin ; Huntingdon ; Allegheny. 



2. Polymnla Canadensis L. Small-flowered Leaf-cup. (Man. 

 p. 9S0 ; I. F. y. jS6j. ) In damp, rich shaded places, western Ont. 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. perfoliaturn. 



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



of 3 or 4. 2. .S". trifoliatum. 



Leaf-blades pinnatifid or bipinnatifid. 3. S. laciniatuni. 



1. Silphium perfoliaturn 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. F. /. 3S6/.) 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. f. 3Sbg.) On prairies. Pa. to S. Dak., Ala., La., Kans. and 

 Tex. — Pennsylvania : Allegheny. 



27. CHRYSOGONUM L- 

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

 I. F. /. 3SJI.) In dry soil, southern Pa. to Fla. — Pen7isylvania : Lan- 

 caster ; Franklin. 



