12 
Go, 2699, 1882; 1892; E. A. Mearns, no. 50,.1887 ; T. E. Wilcox. 
1893. New Mexico: H.H. Rusby, no. 128, 1881. 
The -Argentinae are a natural group, perhaps worth generic rank. 
The plant is propagated by true runners as in /vagaria. The 
style is lateral as in that genus and the achene large with thick 
corky shell. These characters are not found in any other species 
of Potentilla, at least not in America. All the species belonging here 
have pinnate leaves more or less white silky, at least beneath, The 
species of the group are P. anserinoides of New Zealand and the 
following: 
PoTENTILLA ANSERINA L. Sp. Pl. 495. 1753. 
This well known species is found in the colder part of the 
north temperate and the arctic zones of both hemispheres, ex- 
tending in North America as far south as New Jersey and Ne- 
braska, and in the mountains to New Mexico. The following 
varieties may be distinguished : 
PoreNTILLA ANSERINA GRANDIS Torr & Gray, Fl. N. Am. 1: 444. 
1840. 
A luxuriant form growing among grass, with larger, erect or 
ascending leaves, sometimes one foot long. It is common on 
the Pacific coast from California to Alaska, but also collected in 
‘Montana, Newfoundland and Greenland. 
POTENTILLA ANSERINA CONCOLOR Ser. in DC. Prod. 2: 582. 1825. 
It differs from the species in the leaves, which are silky white 
on both the upper and lower surfaces. In America it is confined 
to the Rocky Mountain Region from Mackenzie River to New 
Mexico, California and Alaska. 
PoTENTILLA Ecepi Wormsk. Fi. Dan. g: fase. 27. 5. 
Potentilla Anservina Egedii Torr. & Gray, Fl. N. Am. 1: 444. 
1840. 
Potentilla Anserina Groenlandica Tratt. Ros. Mon. 4: no. +13. 
1824. 
I think that this is a good species, differing from P. Anseria 
in the delicate habit, the deeper and more open incisions of the leaf- 
lets and the scant pubescence... In the specimens examined by me © 
: the achenes were also different in shape. In P. Lgedi they were 
