88 Rydberg: Notes on Rosaceae 



briefly described. The other is usually, but not always, a larger 

 plant, with the terminal leaflet decidedly petioled, the leaves 

 dark green above, white-tomentose beneath, with oblong or lance- 

 olate divisions and larger petals usually decidedly emarginate. 

 I take it as the same as Lange's P. pulchella elatior, but as the name 

 elatior is not available as a specific name I proposed the name 

 Potentilla subarctica. 



Dr. Wolf does not admit P. multifida to North America, al- 

 though I included it in my monograph. We have, however, 

 specimens from this continent, which I can not separate from Old 

 World material. Among others may be mentioned the following 

 specimens: 



Canada: Raft River, west coast of Hudson Bay, August 9, 

 1904, Spread-borough 62383; Pipestone Creek, Rocky Mountain 

 Park, July 7, 1904, Macoun 65150. 



Robinson and Fernald, in Gray's New Manual, reduced Poten- 

 tilla litoralis Rydb. to a synonym of P. pennsylvanica L. Their 

 idea of the latter was evidently based on that of Watson, for their 

 description is copied verbatim from that in the sixth edition of 

 Gray's Manual, except that the height of the plant is given in 

 decimeters instead of feet. It is natural to suppose that a plant 

 named P. pennsylvanica should have come from the east, and in 

 the fifth edition of Gray's Manual the .given range includes even 

 "Pennyslvania?" It is entirely wrong, however, to apply the 

 name P. pennsylvanica to our coast plant, which I described under 

 the name P. litoralis. 



Linnaeus did not describe his Potentilla pennsylvanica from a 

 plant collected in Pennsylvania but from plants cultivated in 

 the gardens of Europe under that name. Jacquin, in his Hortus 

 Vindobonensis, illustrated it under that name, and if I am not 

 mistaken Linnaeus had received his specimens from Vienna. 

 Dr. Wolf, who admits P. litoralis as a good species states: "This 

 [P. pennsylvanica var. communis T. &G.; P. missourica Schrader] 

 is the true P. pennsylvanica of Linnaeus, the one figured by Jacquin, 

 the one cultivated in the botanical gardens since Linnaeus' time 

 and for long time escaped in the vicinity of Paris." Dr. Wolf 

 therefore fully supports my interpretation of P. pennsylvanica. 

 What it is, anybody may ascertain for himself by looking up the 



