The Pleistocene Flora. 185 
there were at least two distinct periods, characterised, on the one hand, by a 
climate equivalent to that of the middle United States at the present day, and, 
on the other hand, a climate equivalent to that of Quebec and Labrador. On 
the other hand, the flora of Green’s Creek and that of Montreal is practically 
identical with that now existing in the same localities. It thus represents a 
climate colder than that of the Don period, but somewhat warmer than that 
of the Scarborough period, but present evidence does not enable us to as- 
certain, if these deposits were laid down before or after the Scarborough 
deposits. The following summary given by PENHALLOW (1900) will probably 
assist in conveying a clear idea of the distinctive differences in the vegetation 
of these three periods. 
Pleistocene Flora’). B5 B 3 a = E 3 
BE |s#2|$ez 
Bi 
Abies balsamea L. . ih, + ie 
Acer pleistocenium Dawebk ö Penbäliow. \ | + | _— 
Acer saccharinum Wangenh. (= A.saccharum Marsh. \ — .1.— + 
me Er 0 Se Ar re + | — — 
a a N u + 
Alnus sp... ee + — 
Asimina tilohe Zr a Re BEN —_ —_ 
Bötäla Intea. Mich. 1. a. ee — + 
Brasenia peltata Pursh. (= B. purpurea Michx.) . — _ a8 
Be ee ee ee N —_— 10 - 2% 
Care NOBBEBa Wahn ee. — - - 
Cara Biagenanıca Laim... er. _ ns 
Carex reticulata Mill. : u E= — 
Besie alba Nutt. ie Hicoria ovata Mill.) . ‘ + -_ 3 
p e- ae 2) + ii — re 
er Punctata Jaeg. =: 53° 4 +... —- er 
Cyperaceae . . Ban a 8 
Drosera rotuntifolia = ee u Ex 
lodea canadensis Michx. (= Philotria canadensis | 
icha.) ee — I. Pr 
Encyonema prostam 2... 5... a + 
Egquisetum Imose En 2 en, nn + 
» Scitpöides Mic . .-. .-. 00... _— | — + 
» wvaicum ran 22, _— 1 — “R 
1) In this and all subsequent lists, the author cited is the one who first applied the specific, 
or varietal name to the plant, whether it was placed at first in the right, or the wrong genus. 
