356 RYDBERG: NOTES ON ROSACEAE 
ARGENTINA EGepit (Wormskj.) Rydb. 
Hupson Bay REGION: Cape Jones, 1899, A. P. Low 63182. 
LABRADOR: Rama, 1899, Stecker 368. 
GREENLAND: Disco, 1902, M. P. Porsild g21; Kuanersuit 
1448; Fiskernaeset, Holboell. 
ICELAND: Mura, 1888, C. Sprague Smith. 
COMARUM 
As I have stated in a previous paper, Dr. Wolf erroneously 
referred Comarum palustre L. or Potentilla palustris Scop. to the 
section POTENTILLAE TRICHOCARPAE, subsection NEMATOSTYLAE, 
series SUFFRUTICULOSAE. The ovaries and carpels are perfectly 
glabrous and the stem is in no way shrubby, the only perennial 
part being the horizontal creeping rootstock. Furthermore Dr. 
Wolf has associated with it Potentilla Salesoviana Steph. This isa 
shrubby plant with hairy ovaries and carpels. The only character 
that would bring them together is the color of the petals, which 
are purple or rose colored. In every respect P. Salesoviana is 
more closely related to Dasiphora than to Comarum. It has the 
shrubby habit of Dasiphora, the pinnate leaves, the scarious, 
sheathing stipules, the flattened anthers, subcordate at the base 
and dehiscent on the margins, practically the same arrangement 
of the stamens, and the woolly achenes of that genus. The only 
characters in which it does not agree with Dasiphora are found in 
the styles and stigmas and the color of the petals. The style 
is filiform, not clubshaped, and the stigma acutish and obsolete, 
not expanded, and bluntly 4-lobed, and the color of the flowers 
is rose or whitish, not yellow. As the color has no value as a 
generic character, the characters of the style and stigma are the 
only characters that would keep it out of Dasiphora. It should be 
included in this genus or else be made a distinct genus. The 
position of the style is lateral in both Dasiphora and Comarum. 
Potentilla Salesoviana differs from Comarum, not only in the 
characters given above, viz., the shrubby habit and the hairy 
carpels, but also in the form of the anthers and arrangement of 
the stamens. 
The form of Comarum palustre common in North America 
differs considerably from the typical form of northern Europe. 
