59o 



COMPOSITAE 



2. V. glauca (L.) Britton. In woods: Pa. and Md. to Ohio, south 

 to Fla. and La. 



Pa. Recorded from Northampton, Bucks, Montgomery, Delaware 

 and Chester counties. 



2. Elephantopus L. 



i. E. carolinianus Willd. In dry woods: S. N. J. and Pa. to Fla. 

 Kan. and Tex. Rare in our area. 

 N. J. Known only from Salem Co. 

 Pa. Philadelphia and Delaware counties. 



Tribe 2. Etjpatorieae 



Achenes 3-5-angled, not ribbed. 



Pappus of 5 broad obtuse scales; aquatic herb with linear, 



whorled leaves. 3. Sclerolepis. 



Pappus of numerous capillary bristles. 



Involucre of more than 4 bracts; erect herbs. 4. Eupatorium. 



Involucre of 4 bracts; twining vines. 5. Mikania. 



Achenes 8-10 ribbed, or 8-10 striate. 



Bracts of the involucre strongly striate-nerved; heads panicled 



or corymbed in our species. 6. Kuhnia. 



Bracts of the involucre faintly striate, if at all; heads spiked or 

 racemed. 7. Lacinaria. 



3. Sclerolepis Cass. 



1. S. uniflora (Walt.) B. S. P. In shallow ponds and streams: 

 N. H. to Fla. 



Known in our area only from the southern part of the pine- 

 barrens and in Cape May Co., N. J. Local but abundant where 

 found. 



4. Eupatorium [Tourn.]. L. 



Leaves petioled, verticillate in 3's or 6's, or the upper opposite. 



Leaves rugose, pubescent; inflorescence depressed. I. E. maculatum. 



Leaves nearly glabrous; inflorescence pyramidal. 2. E. trifoliatum. 



Leaves opposite, rarely in 3's, or the uppermost alternate. 



Involucral bracts imbricated in 2 or more series, the outer 

 shorter. 

 Leaves not clasping nor connate-perfoliate. 

 Leaves narrowed at the base. 



Bracts of the involucre acute or cuspidate. 

 Leaves linear-lanceolate, sparingly 



toothed, 4-12 mm. wide. 3. E. leucolepis. 



Leaves oblong or lanceolate, scarcely 



toothed, 1-4 cm. wide. 4. E. album. 



Bracts ot the involucre obtuse. 



