RYDBERG: NOTES ON ROSACEAE 89 
illustrations of P. pennsylvanica in Jacq. Hort. Vind. 2: pl. 189, or 
P. missourica in Bot. Reg. 17: pl. 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. virgulata 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 ?. strigosa. In 
proposing the species P. glabrella, | 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. 1: 189. 1832. 
