12() OEOLOOIOAI, sniVKY OK CANADA. 



It is oxtreiucly probable tliat three species tiro iiu'luded in the two 

 nientioneil above, and that the pi'airie foim is a species intermediuto 

 between P. Virginionn and P. dcmism. 



(575.) P. serotina, l--lii'h. Black Cherry. 

 /'. r/)V7t/MVjnrt, Mill, riirsli. :•,•_'<). 

 (V-jvLs'i/.i V'lryiu'uind, Michx. Hook. I'l. t., !(><). 

 CcritsiUJi sin>tii)n, I^iisol. Torr. i^ ( hay, V\. 1., 410. 



IJich woods and fence corners. (Growing into a very large tree in 

 western Ontario, where it attains its greatest dimensions, overtopping 

 oihor trees of the forest. North-west Ann, Halifax, N.S. (Lawson.) 

 Ox Bow, Salmon Kiver, N.B., rare. (Fowler's Cat.) Eastern Town- 

 ships. Q. {Brunei.') Abundant throughout Ontario, and as far west as 

 the Kaniiiiistiquia l\ivcr, Lalcc .Su])crior. {Macoun.) 



156. NUTTALLIA, Torr. & Cray. (OSO BERRY.) 



(57G.) N. cerasiformis, Torr. it <iray. 



Vicinity of Victoria, Vancouver Island, and up the Fraser as far as 

 Yale, B.C. {Macoun.) 



157. SPIR/EA, Linn. (MEADOW-SWEET.) 



(577.) S. salicifolia, Linn. Common Meadow-Sweet.) 



S. hypcricifolia, Marsh. Pursh, 341. 



S. hypericifolia, var. Plunkenetia, Hook. Fl. I., 171. 



Low damp places, generally near ponds and margins of streams, 

 from Newfoundland, Nova Scotia, New Brunswick and westward to the 

 base of the Eocky Mountains. Point Barrow to Mackenzie Eiver on 

 Arctic Sea. (Pullen.) The leaves of this species assume a multiplicity 

 of forms. 



(578.) S. tomentosa, Linn. Hardback. Steeple Bush. 



Low rich grounds. Common in Nova Scotia. (McKay.) Eather 

 scarce in New Brunswick. (Foiolefs Cat.) Not rare in Quebec and 

 extending in Ontario through the northern counties to Muskoka. 

 (Burgess.) 



(579.) S. betulifolia, Pallas. Birch-leaved Spiraea. 



S. chamcedrifolia, var, media, Pursh, 342. Hook. Fl. I., 171. 

 S. corymbosa, Raf. Gray, ^Manual, 149. 

 -S'. chamcedrifolia, var. ,3., Hook. Fl. I., 171. 



Abundant in thickets on the Cypress Hills and in the Bow River 



