396 
rubricaulis Lehm. and have made it a variety of the present spe- 
cies. I regard the other form as a new species and it will be dis- 
cussed later. 
P. dissecta varies much in the form of the leaves. In the type 
of P. diversifolia Lehm. the lower leaves were pinnate with. ap- 
proximate leaflets, but all the leaves are as often perfectly digitate. 
The leaflets are larger than in the other related species, oblance- 
olate, and generally seven in number. In the typical form they 
are generally appressed-hairy. All specimens seen are from the 
plain and mountain regions of the West, the range extending 
from Colorado to California, British Columbia and Saskatchewan. 
POTENTILLA DISSECTA GLAUCOPHYLLA (Lehm.) Wats. Proc. Am. 
Acad. 7: §56. 1873. 
P. diversifolia glaucophylla Lehm. Rev. Pot. 73. 1856. 
Leaves nearly glabrous, glaucous-green and always digitate. 
The range is the same as that of the species, but it is much 
more common within the United States. 
POTENTILLA DISSECTA RUBRICAULIS (Lehm.). 
P. rubricaulis Lehm. Nov. Stirp. Pug. 2: 11. 1830. 
Leaves somewhat tomentose beneath when young. It may be 
a hybrid between P. dissecta and P. nivea or P. concinna, as it 3S 
rare and only found in the mountains, where these species also 
grow. 
POTENTILLA DECURRENS (Wats.). 
P. dissecta decurrens Wats. Proc. Am. Acad. 7: 557. 1873: 
This species much resembles the preceding, especially the vat- 
slaucophylla, but it is a more cespitose plant and has smaller and 
thicker leaves with prominent veins beneath. The leaflets are genet 
ally five and the lower often attached a little lower down and de- 
current on the petioles, but this is not always the case by far. Itis 
found in the higher moutains of Utah, Wyoming and Montana. 
Potentilla Ranunculus Lange, Fl. Dan. p/. 2964, from Greenland, 
comes near to both the preceding, differing from both in the more 
deeply dissected leaves and scaly rootstock. The leaves resemble — 
much those of P. decurrens, but are perfectly digitate and much — 
thinner. It seems to be a very rare plant. eee 
