502 Rypsperc: Nores ON ROSACEAE 
eties of P. nivea. P. Hookeriana, at least, is very distinct, and 
were it not for the 3-foliolate leaves, I would associate it with the 
MULTIFIDAE group, especially with P. pseudosericea and P. pauct- 
juga. The style is just as fusiform as in those species and the 
inflorescence is compact as in that group, not open as in the typical 
species of the NIVEAE. 
Dr. Wolf also regards P. prostrata as a variety of P. nivea, in 
this respect following Dr. Lehmann, but neither Lehmann nor 
Wolf seems to have seen the type of P. prostrata Rottboell. Dr. 
Wolf refers to it a specimen collected by Morten Pedersen, labeled 
as P. quinquefolia Rydb., but according to Wolf, better referable to 
P.nivea macrophylla. It is probably Pedersen 496 that is referred 
to, but this has nothing to do with P. prostrata Rottb. The type 
of the latter is in the herbarium of the Botanical Garden at 
Copenhagen, where I saw it in 1901 and drew from it the descrip- 
tion which is found in the North American Flora. I have seen 
no other specimen resembling it, and no form of P. nivea or of any 
of the species often included in it approaches it. The leaflets 
resemble those of P. gracilis but are three in number, and the 
flower and inflorescence are different. 
NEW YorK BOTANICAL GARDEN. 
