124 GEOLOGICAL SURVEY OF CANADA. 



154. CLEDITISCHIA, Linn. (HONEY LOCUST.) 



(56t.) C. triacanthos, Linn. Three-thorned Acacia. 



This species is common in cultivation throughout Ontario, and is 

 quite hardy. In the summer of 1882 numerous trees of it were found 

 growing on the sand dunes of Pelee Point. The seed had probably 

 drifted across the lake from Ohio, as sand is not the true habitat of 

 this tree. 



XXXII. EOSACBiE. Eose Family. 



155. PRUNUS, Tourn. (PLUM. CHERRY.) 



(568.) P. Americana, Marshall. "Wild Plum. 



P. nigra, Ait. Pursb, 331. 



Cerasus nigra, Loisel. Hook. Fl. 1., 167. 



Common in thickets from Montreal westward to Eed Eiver and the 

 Assiniboine, about the 100° meridian. 



Var. mollis, Torr. & Gray, PI. I, 407. 

 ? P. Canadensis. Linn. Pursh, 330. 

 P. hiemalis, Michx. Fl. I., 284. 

 P. mollis, Terr., Fl. U.S., 470. 

 Cerams hiemalis, Seringe. Hook. Fl. 1., 168. 



La Grand Chaudi^re [Chaudi^re Falls, Ottawa]. (?) (Pursh.) This 

 is the black-fi'uited variety of om- wild plum, and is to be looked for 

 throughout Ontario. It is probable we have two species in our terri- 

 tory. 

 (569.) P. maritima, Wang. Beach Plum. 



P. sphcerocarpa, Michx. Fl. 1., 284. 

 P. pubescens. Pursh, 331. 



I introduce this species on the authority of L'Abbe Ovide Brunet, 

 who quotes Pui'sh and the Hon. William Shepherd as his authorities. 

 Borders of the Ottawa (?). (Pursh.) It may be looked for on the 

 Island of Grand Manan and at St. Stephen, New Brunswick. 



(570.) P. pumila, Linn. Sand, or Dwarf Cherry. 



Cerasus pumila, Michx. Hook. Fl. 1., 167. 



P. depressa, Pursh, 332. 



Cerasus depressa, Seringe. Hook. Fl. L, 168. 



Sand beaches and sand dunes and plains. St. John Eiver, and along 



