356 Rydberg: Notes on Rosaceae 



Argentina Egedii (Wormskj.) Rydl). 

 Hudson Bay region: Cape Jones, 1899, A. P. Low 63182. 

 Labrador: Rama, 1899, Stecker 368. 



Greenland: Disco, 1902, M. P. Porsild Q21; 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 is a 

 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. 



