3IIDDLESEX FLOKA. 21 



ANACARDIACE>E. CASHEW FAMILY. 



Ehus, L. Sumach. 



R. typhina, L. Staghorn Sumach. 



Common. Juue-July. 

 R. glabra, L. Smooth Sumach. 



Common. The form var. laciniata, Carriere, has been found 



along the F. R. R. in Weston. June-July. 

 R. copal Una, L. Dwarf Sumach. 



Rather common. July. 

 R. venenata, DC. Poison Sumach. Dogwood. 



Common. June. 

 R. Toxicodendron, L. Poison Ivy. Mercury. 



Both the upright and running forms are very common. June. 

 a. Cotimis, L. 



Often found escaped, but can scarcely be considered naturalized. 



June. Int. from Eu. 



VITACE>E. VINE FAMILY. 



ViTis, Tourn. 



V. Labrusca, L. Northern Fox Grape. 



Common. A variety with white fruit occasional. June. 



V. aestivalis, Michx. Summer Grape. 

 Grotoii (C W. Jenks) ; Medford (George E. Davenport) ; Concord, 

 rare (Minot Pratt); Weston (L. L. Dame). Less common than 

 V. Labrusca. June. 



V. riparia, Michx. (V. cordifolia, Michx., var. riparia, Man.) 

 Sudbury (Dr. C. W. Swan). The V. cordifolia reported at Concord 

 by Minot Pratt is probably this species. Rare. May. 



Ampelopsis, Michx. 



A. quinquefolia, Michx. Woodbine. Virginia Creeper. 

 Common. July. 



Rhamnace^. Buckthorn Family. 

 Rhamnus, Tourn. 



E. CATHARTICA, L. BUCKTHORN. 



Medford, Framingham, Ashland, et al. May-June. Nat. from Eu. 

 Ceanothus, L. 



C. Americanus, L. New Jersey Tea. 

 Common. July. 



