CONVOLVULACEAE 513 



Conn. Rare and apparently confined to the coastal part of the 

 state. 



N. Y. Common on L. I. and S. "I,, unknown in the Bronx, 

 decreasing up the Hudson Valley to Ulster Co., there rare at 

 the lower elevations, unknown northward. 



N. J. Rare and local in Bergen, Passaic, Warren, Morris, Hunter- 

 don, Somerset, Mercer, Middlesex and Monmouth counties; not 

 known in the pine-barrens; at Cape May as a weed. 



Pa. Pike, Northampton, Montgomery, Delaware and Chester 

 counties. 

 Distribution very curious. Above the fall line apparently most 



common on limestone and serpentine, but common also on the 



coastal plain on L.I. 



3. Cynanchum L. 



1. C. nigrum (L.) Pers. Escaped from gardens: Mass. to Pa. 

 and Ohio. Introduced from Europe. 



Rare as a garden escape in our range, often locally wanting. 



C. Vincetoxicum (L.) Pers. has been collected ac Queens, L. I., and C. acutum L. 

 on ballast near Communipaw, N. J. 



4. Vincetoxicum Walt. 



1. V. obliquum (J acq.) Britton. In thickets: Pa. to Ohio, Va. 

 and Ky. 



Known in our area only from Montgomery, Philadelphia, Dela- 

 ware and Chester counties in Pa. 



I can find no evidence that the reported occurrence of V. Shortii (A. Gray) Britton, 

 in Pa. is supported by specimens. 



The reported occurrence of Gonolobus laevis Michx. in Pa., cannot be verified so far 

 as our area is concerned. Periploca graeca L., a European weed, has been collected near 

 Philadelphia; it is otherwise unknown in our area. Philibertia gracilis D. Don. has 

 been collected as a waif near New York. 



CONVOLVULACEAE 



Style 2-cleft or 2-parted. I. Stylisma. 



Style entire up to the stigma. 

 Stigmas capitate or globose. 



Corolla salveriform; stamens and style exserted. 2. Quamoclit. 



Corolla funnelform or campanulate; stamens and style 

 included. 3. Ipomoea. 



Stigmas 2, filiform or oblong. 4. Convolvulus. 



34 



