Mr. Tuckerman, on some Plants of New Engiand. 27 
I have observed constant elevation and depression of the ice, 
three or four feet in thickness, during winter, at Green Bay, with 
crevices uniformly broken, along shore, through which the water 
overflowed extensive portions of the surface, indicating those un- 
dulations observable during every other period of the year. 
I have also the concurrent testimony of several gentlemen of 
intelligence, that undulations are observed, almost uniformly, 
throughout most of the great northern lakes. 
Detroit, Michigan, Jan. 1, 1843. 
Arr. IV.—Observations on some interesting Plants of New 
England ; by Evwarp Tuckerman, Jun. 
CampanuLa RoTunpDIFOLIA, (L.)—Hab. («.) Moist rocks, Notch 
of the White Mountains. (¢.) Var. alpina: caule 3-6-poll. 
unifloro, foliis caulinis nunc linearibus, radicalibus cordatis ova- 
tisve crenatis s. integris. White Mountains; stony alpine moor 
on Mount Monroe.—Our plant of the Notch is a little dwarf- 
ed, but differs apparently in no other respect from the form 
of the low country. I have found this very state in wet places 
in the alpine regions. ‘The plant above noticed as a variety, is 
very distinct in its ordinary habit, but the examination of more 
than thirty excellent specimens, has led me to doubt every char- 
acter by which I had supposed it might be distinguished. The 
stem-leaves, often regularly linear, vary to lanceolate wherever 
the plant attains to an inch or two more of height; the radical 
leaves occur cordate, cordato-ovate, and ovate; crenate, crenu- 
late, and entire. The length of the segments of the calyx does 
not seem in our plant to afford any character, since in some of 
my specimens of the alpine variety, this is all but twice as great 
as in others —The Campanula linifolia of DC. Prodr. 7, 471, 
Hook. Bor. Amer. 2, 27, I have not seen; but if the above ob- 
servations are, as I believe, correct, its claims to rank as a species, 
would hardly seem to be greater than those of our variety. 
Is not this what Pursh saw in Peck’s herbarium, and after- 
wards described as ‘‘Swertia pusilla,” from ‘specimens from 
Labrador, in the Banksian herbarium,” the New England station 
being no doubt given from memory. I refer only to the White 
Mountain Swertia, to which our Campanula makes the nearest 
