2 
? 
PoTENTILLA EFFUSA Dougl.; Lehm. Stirp. Pug. 2: 8. 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 effusa gossypina Nutt., Torr & Gray, Fl. N. Am. 1: 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. gossypina. These specimens Dr. Hooker identified as 
P. arachnoidea Douglas, which is P. Pennsylvanica arachnoidea 
Lehm. 
¥ POTENTILLA FILICAULIS (Nutt.). 
Potentilla effusa fiicauls Nutt.; Torr. & Gray, Fl. N. Am. 1: 
437- 1840. 
This is known from only two fragmentary specimens, one, the — 
original of Nuttall, in the Torrey Herbarium at Columbia Univer- 
sity, the other collected by Dr. J. M. Coulter, in 1872, near Fort 
Hale, and preserved in Dr. Porter’s privaté collection. The stem 
is very slender, filiform. As the pubescence is somewhat silky, it 
is probably more related to the following species :* 
PoTeNnTILLA Hipprana Lehm. Stirp. Pug. 2: 7. 1830. 
Potentilla leucophylla Torr. Ann. Lyc. Nat. Hist. N, ¥. 47 197. 
1827. Not Pallas. 
Potentilla leneophylla Eat. Man. Ed. 5, 344. 1829. 
The name used by Eaton seems to have been overlooked alto- 
gether. It may be claimed that the name given was only a mis- 
print for P. /eucophylla, the original name, which, however, is ante- 
dated by P. leucophylla Pallas, a synonym of P. nivea. The name 
P. leneophylla, which means woolly-leaved, a very appropriate name, 
is not only found in the fifth edition of Eaton’s Manual, but also 
in the sixth and seventh editioas and in Eaton & Wright’s North 
“# Since the above was written I have found a sheet of good specimens in a colt 
lection from the Iowa Agricultural College at Ames. These specimens show tha- 
the plant is more nearly related to P. Hippiana than to P. effusa, having practically — 
the same pubescence and sepals as that species, but is much smaller. It has often _ 
subdigitate leaves, and holds about the same relation to P. Hippiana as P. saximon-— 
tana and P. minutifolia do to P. pulchertima, and may better be referred to the i 
soa cende group. 
