Rydberg: Notes on Rosaceae 353 



mens in the herbarium of the New England Botanical Club, 

 although I saw all in the Gray Herbarium. I have never seen 

 any one, however, with such broad rounded petals as are usual 

 in A. occidentalis. The latter has usually also broader and more 

 obovate leaflets. Even if A. occidentalis and A. litoralis should be 

 one species or variety, as you please, and the characters assigned 

 should be found inconstant, the name of the eastern plant should 

 not be Potentilla pacifica Howell, for that species was based on 

 P. Anserina (3 grandis T. & G. The type was collected by 

 Scouler and a fair duplicate is in the Torrey Herbarium. If I 

 have not known the eastern plant "in its full beauty," I doubt if 

 Professor Fernald has seen Potentilla pacifica in its. At least he did 

 not see it in the Gray Herbarium, for if I remember rightly there 

 was but one fair specimen of it there, shortly before my manuscript 

 went to press. 



The first synonym given under Potentilla pacifica by Professor 

 Fernald is P. Anserina groenlandica Tratt. The type of the 

 latter, collected by Giesecke, I have not seen, but Trattinick's 

 description points evidently to the form of P. Egedii Wormskj. 

 with the leaves whitened beneath. Notwithstanding the fact that 

 Dr. Wolf limits P. Anserina Egedii to the glabrous form the fact 

 remains that in Argentina Egedii (Wormskj.) Rydb. the leaves 

 are whitened beneath or not, even in the same plant. Evidently 

 Dr. Wolf includes in his var. groenlandica also the arctic plant 

 from Alaska, which I described as A. sabarctica. This Professor 

 Fernald reduced to a synonym of Potentilla pacifica. Placing 

 the duplicate of the types of Argentina pacifica, collected by Scouler, 

 and the type sheet of A. subarctica collected by Dr. A. Hollick side 

 by side, few persons would regard them as the same species or 

 at least not as the same variety. P. subarctica is characterized 

 by its decidedly turbinate hypanthium and few achenes, char- 

 acters found only in this species and Argentina Babcockiana. 

 In all the others the hypanthium is almost flat. The petals are 

 rarely over 8 mm. long, while in A. pacifica they are usually 12-15 

 mm. long. In the latter the leaves are almost erect while in the 

 other species they are spreading, except when growing among tall 

 grass. 



Dr. Wolf's treatment in including all the forms belonging to 



