496 RypBERG: Nores ON ROSACEAE 
mistake. Potentilla decurrens of my monograph, and as under- 
stood by A. Nelson, Joc. cit., or A. diversifolia var. decurrens 
Th. Wolf, mainly, is not the same as Watson’s plant. It is a 
plant related to P. glaucophylla and P. Ranunculus, while the 
original P. dissecta decurrens is related to P. ovina J. M. Macoun: 
In the North American Flora, the former is described under the 
name P. perdissecta. 
Potentilla Ranunculus Lange, which Dr. Wolf associates with 
P. ranunculoides H. B. K., is not related to that species but to 
the one just discussed above and to P. glaucophylla. It is hard 
to distinguish it from these species except by the rootstock, which 
in P. Ranunculus is much branched and creeping and densely 
covered with scales. This character is found in many arctic 
plants and is perhaps due to the climatic conditions. P. Ranun- 
culus has usually broader leaflets than P. glaucophylla and they 
are less dissected than in P. perdissecta. 
Potentilla multisecta (S. Wats.) Rydb. is closely related to P. 
perdissecta. Dr. Wolf reduces it back to a variety of P. dissecta, 
as it was originally described by S. Watson. This is really a 
transfer to another species, for P. dissecta of Watson was not the 
same as P. dissecta Pursh, but was P. diversifolia Lehm. This 
transfer is made, although Dr. Wolf expressly states that he has 
not seen P. dissecta Pursh. Professor Nelson, loc. cit., has omitted 
this species, although it has been collected in Wyoming. 
% SUBVISCOSAE 
Very little can be said about this group, as little material has 
been received since my monograph and few new facts have been 
brought to light since that time. Through further study of Poten- 
tilla Wheelerit viscidula, 1 have come to the conclusion that it 
deserves specific rank and it is given such in the North American 
Flora. Dr. Wolf has made no change in the species of this group, 
as he had seen specimens of only P. Wheeleri. As stated before, 
he includes the whole group in his RANUNCULOIDEs. 
CONCINNAE 
This group has been a little modified from the treatment in 
my monograph and a few species have been transferred from other 
groups. 
