Shafer : Vascular Flora of Allegheny County. 96 



II P. emersum (Michaux). Swamp persicaria. 



Davis Island. Shore at head of island, August, 1898. 



^ P. Virginianum Linn?eus. Virginia knotweed. 



^ P. arifolium Linngeus. Halberd-leaved tear-thumb. 



Stowe Township, swamp near Turner Station, Sept. 15, 1899. 



* P. sagittatum Linnaeus. Arrow-leaved tear-thumb. 



* P. convolvulus Linnajus. Black bindweed. 



* P. scandens Linnaeus. Climbing false buckwheat. 



* P. cilinode Michaux. Fringed black bindweed. 



FAGOPYRUM Gartner. 



* F. Fagopyrum (Linnaeus). Buckwheat. 



ARISTOLOCHIACEiE Blume. 



BIRTH WORT FAMILY. IV-13. 



ASARUM Linnaeus. 



* A. Canadense Linnseus. Wild ginger. 



Moon Township, among rocks, Laschell's Hollow, April 20, 

 1899. 



* A. reflexum Bicknell. Short-lobed wild ginger. 



Our commonest form, seems to belong here. 



ARISTOLOCHIA Linnteus. 



* A. Serpentaria Linnaeus. Virginia snakeroot. 



* A. macrophylla Lamarck. Dutchman's pipe. 

 A. Sipho L'Heritier. 



