431 
Arizona: J.G. Lemmon, no. 399, 1881; H.H. Rusby, 1883. 
The Concinnae have the same relationship to the iveae as the 
Aureae have to the Frigidae, t. e., they are Niveae with more than 
three leaflets. From the Sudbviscosae they differ by the tomentum 
on at least the lower surface of the leaves, and by their petals, 
which are not at all unguiculate. 
POTENTILLA CoNcINNA Richardson, Frank. Journ. 736. 1823. 
P. concinna resembles P. nivea in many respects, especially the 
variety quinquefolia, but is always more or less prostrate, and has 
broader petals and sepals. It is very variable as to the shape of 
the leaves. In the typical form the leaflets are obovate or cuneate 
and crenate, and slightly tomentose also on the upper surface. It 
ranges from Colorado to Utah and Saskatchewan. 
Potentilla concinna humistrata Rydberg, Cont. U. S..Nat. Herb. 
3* 497 (P. concinna humifusa Lehm. Rev. Pot. 112. P. humifusa 
Nutt. Gen. 1: 310.) is a less spreading form with leaves that 
are green on the upper surface, but the two forms grade into each 
other in so many ways that it is useless to try to draw a line be- 
tween them. | 
P. CONCINNA DIVISA 0. V. 
P. nivea dissecta §. Wats. Proc. Am. Acad. 7: 556, at least 
in part. 1873. Not 2 dissecta Pursh, 1814. 
_ Leaflets pinnately divided. In a few cases the leaves are also 
Pinnate rather than palmate. 
_ Dr. Watson included the three first specimens cited below in his 
P. nivea dissecta, but in every respect they are much nearer P. con- 
cinna than P. nivea, the sepals, petals and general habit being ex- 
actly that of the former. 
Rocky Mountains : Douglas. 
Montana : Howard. 
South Dakota: Jenney. 1875; W. H. Forwood, 1887; P. A. 
Rydberg, nos. 672 and 673. 1892. 
Assiniboia: John Macoun, no. 10,468, 1895. 
PoTENTILLA BICRENATA N. Sp. 
Low and simple from an erect scaly rootstock; stem — | 
5-7 cm. high, about equalling the leaves, 1—3-flowered, nearly 
