302 
flowers, stout habit, large leaves and broad bractlets. /. v¢llosa is 
a native of Alaska and adjacent Asia, but is also found in the 
mountains of British Columbia, Vancouver Island and Washing- 
ton. / 
PoTeNTILLA HookErIANA Lehm. Ind. Sem. Hort. Bot. Hamb. 
1849: Add. 10. 1849. 
Dr. Watson placed this with P. Pennsylvanica on account 
of the style. It is glandular, but scarcely thickened near the 
base, and not curved asin P. Pennsylvanica. In habit it comes 
nearest to P. uivea; and as the style is often glandular in P. villosa 
and sometimes in P. nivea, it is better to include P. Hookeriana in 
this group, with which it agrees in all other respects. It differs 
from P. nivea in the more deeply dissected leaves, the smaller 
flowers, the bractlets, which equal the sepals, and a slightly stricter 
habit. It is a very rare plant. 
POTENTILLA NIVEA L. Sp. Pl. 499. 1753. 
The common form of this species is fully as tall as either of 
the two preceding, but very slender. The flowers are only 15 mm. 
in diameter, the bractlets linear-oblong or lanceolate, shorter than 
the ovate-lanceolate sepals. The obcordate petals only a little 
exceed the sepals. The leaflets are 1-3 cm. long, oblong or obo- 
vate, with broad teeth. P. nivea is distributed throughout the 
arctic regions and in the higher mountains of the northern hemi- 
sphere. In America it ranges from Labrador to Alaska, extend- 
ing in the Rockies as far south as Colorado. 
P. nivea is very variable. The following varieties have been 
collected in America: 
POTENTILLA NIVEA MACROPHYLLA Hook. Bot. Mag. 57: ple 
2982. 
Leaflets very large and deeply incised ; plant taller than the or 
dinary form. 
POTENTILLA NIVEA QUINQUEFOLIA. 
P.nivea pentaph iwlla Lehm. Novy. Stirp. Pug. g: 69. 1851. Not | 
P. pentaphylla Richt. ae 
