BULLETIN 
TORREY BOTANICAL CLUB. 
Vol. 24. Lancaster, Pa., january, = 28, 1897. No. 1. * 
Notes on Potentilla.—VI, 
By P. A. RYDBERG. 
(PLATES 287, 288.) 
The /Hippianae constitute a group somewhat related to the 
Multijugae. They are, however, as a rule stouter than the mem- 
bers of that group, and the leaves are more or less white or gray- 
ish hairy, generally densely silky, villous or tomentose. The 
group contains the following species : 
PorENTILLA. BrEWERI S. Wats. Proc. Am. Acad. 7: 555. 1873. 
Potentilla Brewer’ much resembles P. Plattensis. It has the— 
large stipules characteristic of that species and also essentially the 
the same flowers. ' The leaflets are, however, broader and less di- 
vided and densely silky-villous. In the typical form the cyme is 
rather dense and the flowers larger. It grows in California. 
PoTENTILLA BREWERI EXPANSA S. Wats. Bot. Cal. 1: 179. 1876. — 
Potentilla Plattensis leucophylla Greene, Erythea, 1:4. 1893. || 
_ This resembles P. Plattensis still more, having the open cyme _ 
of that species. It grows also in Nevada and is apparently oe 
common than the species. 
PoreNTILLA crinita A. Gray, Mem. Am. Acad. 1849: 41. 1849. - 
This is of similar habit but easily distinguished by its condu- : 
plicate, appressed-silky cuneate leaflets, which are slightly crenate _ 
at the apex. P. crinita grows on the dry plains of Abbots, New — 
| — southern Uteh ane igechasol | | 
