﻿Some Changes in the Nomenclature of North American Rosaceae 



By P. A. Rydberg. 



The writer had intended to publish the following changes in 

 his forthcoming monograph of the North American Potentilleae ; 

 its publication having been delayed and a friend of his intend- 

 ing within a short time to issue a checklist of North American 

 plants, it seems advisable not to defer the publication longer, 

 especially as some of the changes have been in manuscript 

 for almost a year. Most of these changes occur in the genus 

 Horkelia, which the writer regards as distinct from Potentilla- 

 Many of the species were originally described under the latter 

 genus taken in its wider sense, others as varieties of other species. 

 The reasons for the changes will be discussed more fully in the 

 forthcoming monograph. 



Horkelia frondosa (Greene). 

 Potcntilla frondosa Greene, Pittonia, i : 300. 1889 



Horkelia elata (G 



Potcntilla data ( 

 Potentilla Calif c 

 Professor Green 



100. 1887. 



1891 



Calif c 



from 



with regard to the limitation of species. H. elata differs from H- 

 Californica, not only in the narrower filaments, but also in the 



more 



leaflets. I 



should be regarded as a distinct species. 



/ 



Horkelia Micheneri (Greene). 



Potentilla Micheneri Greene, Erythea, 1:5. 1893. 



• Horkelia Clevelandii (Greene). 

 Potcntilla Clevelandii Greene, Pittonia, 1 : 102. 1887 



i 541 



