RypDBERG: NOTES ON ROSACEAE 85 
cespitose, scaly, thick subterranean rootstock, the branches of 
which bear at the summit numerous basal leaves and short erect 
or ascending stems bearing only reduced leaves. The pedicels 
are in fruit erect or strongly ascending. These are characters 
that need no microscope to be seen. The distinction between 
P. Nelsoniana (P. pinnatisecta A. Nelson) and P. ovina (P. diverst- 
folia pinnatisecta S. Wats.) are that the leaflets of the former are 
cuneate in outline, glabrate in age, and cleft only above the middle; 
while in P. ovina they are obovate in outline, permanently hairy, 
distinctly pectinately pinnatifid. The latter is a much smaller 
plant than the former. 
Dr. Wolf also makes P. wyomingensis a mere form of P. plat- 
tensis pinnatisecta, and this is done evidently without having seen 
any specimens, for he states: ‘‘From the long diagnosis of the 
author can it absolutely not be seen how this ‘species’ can be 
specifically distinguished from his P. pinnatisecta.”’ The fact 
is that the type of P. wyomingensis is a better developed specimen 
of P. monidensis A. Nelson, which Dr. Wolf regards as a distinct 
species. P. monidensis was described from specimens just coming 
into bloom. Aven Nelson, in the New Manual of the Central 
Rocky Mountains, keeps them distinct. The differences given, 
especially the form of the petals, do not hold. 
Concerning P. decurrens, a species belonging to this group and 
most closely related to P. ovina, see my Notes on Rosaceae—IV.* 
As the type of P. dissecta decurrens was rather poor I herewith cite 
better material: 
Uran: Divide between Sevier and Beaver rivers, near Belknap 
Peak, July 28, 1905, Rydberg & Carlton 7355; mountains north of 
Bullion Creek, near Marysvale, July 23, 1905, Rydberg & Carlion 
7152; Bromide Pass, 1894, Jones 5605k. 
ig Wolf has also reduced P. cascadensis to a variety of 
EB. Dy lii, which is simply a matter of opinion. He also 
places P. crinita and P. Lemmoni in the GRACILES PINNATAE next 
after P. ambigens, notwithstanding the fact that neither of them 
has any tomentum. 
Potentilla Richardii is transferred to the RIVALES group on 
account of its style. Dr. Wolf may | be correct. 1 E GEye Bor eeet 
* Bull. Torrey Club 37: 495. 28 oO ¥oro. 
