POTENTILLA THURBERI A. Gray, Mem. Am. Acad. (II.) 5 : 318.
1854.
As described by Gray and Lehmann, P. Thurbeni should be per fectly green and only slightly hairy. Such specimens have been collected as follows : New Thurber, no. 1107, 1851 ; Dr. Henry, 1854; Dr.
Bigelow (Mex. Bound. Surv.), no. 347, 1851 ; E. L. Greene, 1880;
E. Palmer, 1869. Arthona Lemmon, 1881 ; C. G. Pringle, 1884 ; Wooton , 1895.
More than half of the specimens in our collections that are labelled P. Thnzbezi do not agree with the original description, and I take them to represent an undescribed species :