431 



Arizona: J. G. Lemmon,no. 399, 1881 ; H. H. Rusby, 1883. 



The Concbinae have the same relationship to the Niveae as the 

 Aiireae have to the Frigidae, i. e., they are Niveae with more than 

 three leaflets. From the Siibviscosae 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 qtiinqucfolia, 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. 



Potcntilla conciniia Immistrata Rydberg, Cont. U. S. Nat. Herb. 

 3 : 497 {P. concinna Jmmifnsa Lehm. Rev. Pot. 112. P. Jmmifnsa 

 Nutt. Gen. i: 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 n. V. 



P. nivea dissecta S. Wats. Proc. Am. Acad. 7: 556, at least 

 in part. 1873. Not P. dissecta Pursh, 18 14. 



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 

 /*. 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 erect, 

 5-7 cm. high, about equalling the leaves, 1-3-flowered, nearly 



