432 GEOLOGICAL SURVEY OF CANADA. 



543. BCEHMERIA, Jacq. (FALSE NETTLE.) 



(1961.) B. cylindrica, Willd. 



Urtica cylindrica, Linn. Michx. Fl. II., 179. 

 17. capitata, Willd. Pursh, Fl. I., 113. 

 B. cylindrica, var. p. Hook. Fl. II., 142. 



Low moist thickets and in river bottoms throughout Ontario. 

 Abundant on low grounds at the mouth of the Gatineau and at Hull, 

 Q. (Fletcher, FL Ott.~) 



544. PARIETARIA, Linn. (PELLITORY.) 



(1962.) P. Pennsylvanica, Muhl. American Pellitory. 



Usually in crevices of limestone rocks in ravines. Crevices of 

 rocks, Heely Falls, east side, Northumberland Co., Ont. (Macouri) 

 On the lower part of Pelee Point, Essex Co., Ont. (Burgess.') Crevices 

 of rocks, Cypress Hills, N.W.T. ; Pembina Eiver at the crossing 50 

 miles north-west of Edmonton, N.W.T., and at Fort St. James, and 

 Fort McLeod, northern British Columbia. (Macoun.') Crevices of 

 rocks, Elk Eiver, Kootanie valley, Eocky Mountains. (Dawson.) 



XCIV. PLATANACE^E. PLANE-TREE FAMILY. 



545. PLATANUS, Linn. (BUTTON-WOOD.) 



(1963.) P. occidental is, Linn. 



This very large and magnificent tree seems to have its eastern limit 

 in the valley of the Don at Toronto, from thence it becomes more 

 plentiful and increases in size, and at Hamilton and all through the 

 western peninsula of Ontario, in low damp woods it becomes a conspi- 

 cuous forest tree. It seems to prefer river bottoms but in the low 

 country between St. Thomas and Amherstburgh, it is particularly 

 common. 



