Rydberg: Notes on Rosaceae 89 



illustrations of P. pennsylvanica in Jacq. Hort. Vind. 2: pi. i8g, or 



P. missourica in Bot. Reg. 17: pi. 1412. 1831. The description in 



Gray's New Manual is not that of P. pennsylvanica, but of P. 



litoralis Rydb. Unfortunately for me the latter name has to give 



place to P. pectinata Raf., which is without doubt the same as 



our coast plant. 



Dr. Wolf regards Potentilla strigosa, P. arachnoidea, P. atro- 



virens, and P. virgidata as varieties of P. pennsylvanica, but regards 



P. glabrella as a species. It has no better right to such a place 



than the rest. I have treated them all as species, although I 



regard P. arachnoidea especially as very close to P '. strigosa. In 



proposing the species P. glabrella, I cited as a synonym P. se- 



ricea var. glabrata Lehm.,* following Dr. Watson. Dr. Wolf points 



out that the specimen on which this variety was based belongs to 



a form of P. plattensis. From the characterization I believe that 



Dr. Wolf is correct, and that the synonym should be eliminated. 

 New York Botanical Garden. 



*Hook. Fl. Bor.-Am. i: 189. 1832. 



