POTENTILLA EFFUSA Dougl. ; Lehm. Stirp. Pug. 2 : S. 1830.
The pubescence is grayish or whitish tomentose, not at all silky ; the branches are rather divergent and the bractlets much smaller than the acuminate sepals. It grows on the dry plains from New Mexico to Montana, Assiniboia and Minnesota (?).
Potentilla iffusa gossypina Nutt.; Torr & Gray, Fl. N. Am. r : 437.
1840, is still unknown. Dr. Hooker, in London Jour. Bot. 6: 219, states that the plant collected by Geyer (no. 637) was labelled by Nuttall P. ina. These specimens Dr. Hooker identified as P. aracknoidect Douglas, which is P. Pennsylvanica Lehm.