No. 50.] 167 



Order THYMELACEvE . The Mezereum Tribe. 



Dirca, L. Leather-wood. 



palustris, L. Woods, near streams. April. 



Order SANTALACE^E. The Sanders-Wood Tribe. 



Nyssa, L. 



multiflora, Walt. N. sylvatica, Miclix. sylv. N. villosa, Willd. 

 Black Gum. Woods. May- June. 



COMANDRA, Nutt. 



umbellala, Nutt. Bastard Toad-flax . Rocky hills. June. 



Order ARISTOLOCHIACEiE. The Birthwort Tribe. 



Aristolochia, L. 



serpentaria, L. Virginia Snake-root . Shady woods . June . 



Asarum, L. 



canadense, L. Wild Ginger, Coltsfoot. Rocky woods. May. 



Order EMPETRACE^E. The Crowberry Tribe. 



Empetrum, L. Crowberry. 



nigrum, L. Summit of Mount Marcy and Mount Mclntyre. July. 

 Found also on Whiteface Mountain, by Dr. 'Em- 

 mons and Prof. Hall. 



Order EUPHORBIACEiE . The Euphorbium Tribe. 



Acalypha, L. Three-seeded Mercury . 



virginica, L. Fields and road sides. June- August. 



Euphorbia, L. Spurge. 



hypericifolia, L. E. maculata, Michx. Road sides and sandy 



fields . July-September . 

 maculata, L. E. depressa, Torr. in Ell. sk. Cultivated grounds 



and sandy fields. July-September, 

 polygonifolia, L. E. maritima, Nutt. Seacoast. August, 

 obtusata, Pursh. Sandy fields and river banks . July- August . 



