POTENTILLA COLLINA Wibel, Prim. FL Werth., 267. 1799.
This is another species that has been collected in the country at least once, viz., by J. M. Holzinger (no. 3o) at Winona, Minn., in 1887_ It differs from P. alwentea, which it most resembles, by its prostrate or spreading habit, less white-tomentose leaves, which have broader lobes, and flat, not revolute margins.
The 7ormeirti1lae are a small group, characterized by the more or less spreading, prostrate or creeping stem and long-pedicelled,,ax illary flowers. The original. Torment/line have 4-merous flowers,
but sometimes, however, they are 5-merous, and other. species that have regularly 5-merous flowers have no other character would warrant the division into two groups, much less into two genera. The group is mainly European, only one species being a native of North America, viz.: