492 Rvdberg : Notes on Rosaceae 



longipedunculatae 

 This section contains only one species, which Dr. Wolf makes a 

 doubtful variety of P. gracilis. 



Subjugae 

 This group also contains only a single species, Potentilla sub- 

 juga. In my monograph, I included also in this group P. qiiin- 

 quefolia, a disposition which Dr. Simmons in the Flora of Elles- 

 mere Land rightly criticizes. This species I transferred in the 

 North American Flora to the Concinnae group. 



SUBCORIACEAE 



This group contains three species, all Mexican. Dr. Wolf calls 

 the group Ranunculoides and includes in it not only these three 

 species, and the Brevifoliae and Subviscosae groups, but also 

 such diverse plants as Potentilla Townsendii, P. Palmeri, P. Ra- 

 nunculus, P. flab elli folia, P. fragiformis, and P. Sierrae-Blancae, 

 together with P. acuminata, which is a species with pinnate leaves 

 related to P. saxosa. 



Obovatifoliak 



This group also is Mexican and Central American and consists 

 of three species. The first of these, P. staminea Rydb., was until 

 lately known only from the type collection by Ghiesbrecht. It 

 has been collected also in Guatemala, in 1896, Seler 2753. If I 

 am not mistaken, they are the same specimens that Dr. Wolf 

 cites under P. haematochrus on page 226 of his monograph. A 

 few years after its publication I referred to this species doubtfully 

 Pringle 6890. This evidently was the reason why Dr. Wolf re- 

 duced P. staminea to a variety of P. leptopetala Lehm. Pringle 

 6890 is evidently much more closely related to P. leptopetala than 

 to P. staminea. I have been inclined to refer Pringle 6890 and 

 other material collected later in the same region to P. leptopetala, 

 for they agree fairly well with Lehmann's description (except #s 

 to the size of the petals). If, however, Lehmann's figure in his 

 Monographia, pi. 43, is correct, then the plant from which it was 

 prawn must be of a different species from Pringle 6890 or else it is a 

 freak or in an abnormal condition. I have seen neither the type of 



