POTENTILLA TRIDENTATA Soland.; Ait. Hort. Kew. 2 : 216. 1789.
P. retusa Retz. is generally cited as a synonym of P. frit/oda/a and is much older, but P. relusa is described as having yellow flow ers, and in the figure of it in Flora Danica the petals are also yel low, while in P. tridentata, as is well known, they are white. If made from a specimen of P. tridentata it is, indeed, a very poor one, as it resembles Sibbaklia procumbots more than P. h•deniala. It can, however, not represent that species, as the petals exceed the sepals. What P. retusa was, or is, is still a secret.
P. indentata extends from Greenland to the mountains of North Carolina and westward to Minnesota.
Biflorac. This contains only one species, placed by Lehmann with P. fruticosa, P. tridentata and their allies. The style is, how ever, nearly terminal, and the achenes not hairy. It resembles the Frnticosae in the thickish leaves, whose margins are entire, and the non-emarginate petals. The receptacle has also very long hairs.