CONTRIBUTIONS TO THE PLEISTOCENE FLORA 

 OF CANADA 



D. P. ri;MIALL()\V 



Eaely in the present vear I nvcivcl from Professor A. P. Cole- 

 man of Toronto T'niyersity, a vrry line colK.ction of leaves from 



branch which it was possible to identify with accuracy. Thc^c 

 specimens prove to be important since they serve to conhriii in 

 rather striking ways, conclusions already reached through previous 

 studies of the Don material, and they furthermore aflford addi- 

 tional evidence bearing upon the preglacial existence of types 

 now unknown in the living state. It is therefore thought desirabl(> 

 to place on record such facts as are revealed bv a studv of tliis 

 collection. 



^riie last prt'vious record of the Don plants was inade by me in 



cduv of the Plri>ro,vnc of Virginia and Marvland. and the evidence 

 they brin- forward oces to .sh..w that .'ssenTially the .aine flora 



Acer pleistocenicum Penh. — Tlii^ s[)ccics appear- for the fourth 



time in colh-ction. from tlie Don Valley, and in the prcM-nt iir.tance 

 it forms a large p.-nvnta-e of the (Mitirc material. Most of the 



One of the best of tlie>e is reprodnee<l 1um-(> on a (limini>!ied s,.;,le 

 (Fig. 1), as it is nu.re complete than that employed f.>r tlie original 



