Statistics of the Flora of the Northern States. 377 
{ Betula nana. ieee repens. 
t “  papyracea. “ ~herbacea. 
{ Alnus incana. : Pinus Banksiana. 
; ane cordata. + Abies balsamea. 
“ rostrata, |. * 
t “~ phylicifolia. { Larix Americana. 
I “ pedicillaris. + Cupressus thyoides. 
“  Uva-Ursi. { Juniperus communis, 
The mark — prefixed to the name indicates that the species 
extends sihvard to the borders of the Gulf of Mexico. The 
risk * denotes a range northward to the Great Lake a Ae 
the basin of the Saskatchawan; + to the Arctic Circle, or at 
least to lat. 67°. 
It appears then that 34 species, or one half of this list, are of 
< see or alpine rome ranging northward to or within the 
ircle. Fifteen of these are axtiivety alpine or subal- 
plants and occur vonty on our higher mountains as far south 
the rest, those of greatest climatic range are, 
Das tneana, rangin from about lat. 68° to 89°; Salix cordata, 
with an e equally wide range and probably reaching, further jee 
Larix Americana, with about the same southern limit, but in 
elevated region only; Juniperus communis, not fea south ‘of 
lat. 40°; Myrica Gale, and Ribes Cynosbat, Potentilla jruticosa, 
Kalmia’ glauca, Betula pumila, and perhaps Jeibes lacustre, each 
ve a range of 28 or 29 degrees, but none of them are found 
South of lat. 40°. 
Twenty. two species of the foregoing list extend northward 
Into the Saska * a an but ‘three of them (which 
cross the 60th parallel and occur in the basin of the Great Slave 
Take) find their northern limit there 
On the other hand, 24 species pointe southward to the borders 
of the Gulf of Mexico. Fourteen of these have their boreal 
oa in the Saskatchawan district; and nine about the Great 
The following Rare 57 in number, range through from 15 
to 19 degrees of latitu 
t Hudsonia tomentosa. + Acer Pennsylvanicum. 
* Rhus heemeg 
ge 
— Telieacesiwek * “  dasycarpum. 
‘pe wy cea trifoliata. « Amorpha canescens. 
Vitis Labrusca, + Prunus Pennsylvanica. 
“4 Rhamnus alnifolius. + Spirea tomentosa, 
— * Ceanothus Americanus. + Rubus ee 
SBCOND SERIES, VOL. XXIII, NO, 69.—MAY, 1857, Ail 
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