304 
Captain Franklin’s journey. Specimens collected by Richardson 
and named P. Vahliana are in the Torrey Herbarium at Columbia, 
but these, it seems to me, rather belong to P. uniflora. There is, 
however, from the-same collector one specimen, a very small one, 
indeed, which without any doubt belongs to P. Vakliana, but this 
is together with two specimens of F. zava under the name P. nivea 
arctica. Except this specimen and one from Herald Island, all 
specimens seen are from Greenland and the islands of Baffin Bay. 
They are generally labelled P. pulchella. The latter species is 
easily distinguished by its small flowers, the petals scarcely ex- 
_ ceeding the sepals, and its deeply dissected leaves which are pin- 
nate with two approximate pairs of leaflets. 
The /vigidae differ from the Niveae principally in the lack of 
tomentum. They are all low, more or less caespitose, arctic or al- 
pine plants. To this group belong the following : ; 
POTENTILLA RopsinstanA Oakes; Torr. & Gray, Fl. N. Am. 1: 441- 
1838, as a synonym under 
P. minima Robbinsiana Torr, & Gray, /. c. 
P. frigida American authors, not Vill. 
Torrey and Gray placed this species as a variety under P. 
munima and Watson tranferred it to P. frigida. It very much re- 
sembles both of those European species. It comes nearest to P. 
minima in habit, but to P. frigida in pubescence. It differs from 
both in the small petals, which about equal the sepals, and in the 
bracts and the sepals, which are very narrow and subequal. In 
both P. frigida and P. minima the petals are longer than the sepals, 
and these much longer than the bractlets. The same characters 
that distinguish P. Roddinsiana from the two species mentioned 
distinguish it also from its American relatives. The range of P. 
Robbinsiana is very limited. It apparently is confined to the 
White Mountains of New Hampshire. 
POTENTILLA ELEGANS Schlecht. & Cham. Linnza, 2: 22. 1827. 
This species, as far as I know, has not yet been collected in 
America, but is mentioned here because it is quite common across — 
Behring Strait and may be found in Alaska. It resembles P. — 
Robbinsiana in the sepals and bracts, but is a more delicate plant, — 
the leaflets being only 3-5 mm. long and nearly glabrous. 
