CATALOGUE OF CANADIAN PLANTS. 101 



(427.) R. Toxicodendron, Linn. Poison Ivy. 



R. Toxicodendron, var. qucrcifolium, Michx. Fl. L, 183. 



Common in thickets and in fence corners, from Nova Scotia to the 

 Saskatchewan, at Fort Edmonton. (Macoun.) Woods near Yale, B.C. 



(Sill.) 



Var. radicans, Torrey. 



R. radicans, Linn. Hook. Fl. L, 127. 



R. Toxicodendron, var. a, vulgarc, Michx. Fl. I., 183. 



Climbing frequently over fifty feet up both dead and living trunks, 

 in the forest west of St. Thomas, on the line of the Canada Southern 

 Eailway, Ont. (Macoun.) Vicinity of London, Ont. (Burgess.) A 

 very distinct variety, which almost deserves the rank of a species. 



(428.) R. diversiloba, Tori. & Gray. 

 R. lobata, Hook. Fl. L, 127, not Poir. 



On the outskirts of woods in dry soils of North-west America. 

 (Douglas.) 



(429.) R. aromatica, Ait. Fragrant Sumach. 



Dry soil along river banks and on waste, rocky ground. Abundant 

 along the rivers Moira find Trent, Eice Lake Plains, and at Amherst- 

 burg, Ont. (Macoun.) Banks of Niagara and Detroit Eivers. (Mac- 

 lagan.) Wolfe Island, opposite Kingston; Whiskey Island, Lake 

 Huron. (J.. Bell.) Maline Eiver, Dawson Eoute. (Macoun.) 



Var. triiobata, Gray. 



R. triiobata, Nutt. Torr. & Gray, Fl. I., 219. 



Dry, barren soil on river banks. At the Elbow of the South Sas- 

 katchewan, near Strong Current Creek, N.W.T. (Macoun.) Bad lands 

 south of Woody Mountain, and eastward to Pyramid Creek on the 49th 

 parallel. (Dawson.) 



XXXI. LEGUMINOSJL PEA FAMILY. 



128. THERMOPSIS, R. Brown. 



(430.) T. rhombifolia, Richards. 



Cytisus rhomlifolius, Nutt. Pursh, 741. 



Abundant on dry, open prairie, from Manitoba to the Eocky Moun- 

 tains. Especially common northwest-ward from Moose Mountain to 



