82 Rydberg: Notes on Rosaceae 



Mountain plant. Dr. Wolf has called attention to an important 

 difference overlooked by me, viz., that the style in P. rubricaulis 

 Lehm. is much thickened and glandular at the base. He therefore 

 includes it in the Multifidae group. Dr. Wolf also reduces 

 P. minutifolia and P. saximontana to varieties of P. rubripes. 

 As far as P. saximontana is concerned it can not be kept distinct 

 from P. rubripes. I have come to that conclusion by the aid of 

 material sent me by Mrs. M. E. Soth and others from the Pikes 

 Peak region. Concerning P. minutifolia I am still in doubt. If, 

 however, the species are united, the name of the species should not 

 be P. rubripes, which name Dr. Wolf adopts, because that is 

 the latest of the three, being 10 years more recent than the other 

 two, which were published on the same page, P. minutifolia pre- 

 ceding P. saximontana in space. 



Candicantes 

 This group contains only one Mexican species, which Dr. 

 Wolf includes in the Multijugae group. 



Leucophyllae 



In the North American Flora this contains 12 species, of which 

 Potentilla lupina, P. argyrea, P. viridior, and P. Bruceae are pro- 

 posed as new. The first two were based on material formerly 

 included in P. Hippiana. P. lupulina resembles much P. Hip- 

 piana, but the pubescence is coarser, less shining, and more gray, 

 the bractlets are small and the sepals are acuminate as in P. effusa. 

 It is known from only the type locality and vicinity, and all the 

 material seen was collected by Mr. Frank Tweedy. It is rep- 

 resented by his numbers 3214 and 3215, of which the latter was 

 assigned as the type. 



P. argyrea also is related to P. Hippiana, but differs in the 

 dense inflorescence, dull tomentum, and smaller flowers. The dense 

 inflorescence suggests somewhat certain species of the Multifidae 

 group. One of the specimens was originally labeled P. Penn- 

 sylvania. Besides the type, the following specimens belong here: 



North Dakota: Willow City, July 18, 1891, Lee 219. 



Manitoba: Britte, June 27, 1906, Macoun & Herriot 69836. 

 (This specimen is, however, somewhat doubtful.) 



