This section is from the book "An Illustrated Flora Of The Northern United States, Canada And The British Possessions Vol2", by Nathaniel Lord Britton, Addison Brown. Also available from Amazon: An Illustrated Flora of the Northern United States, Canada and the British Possessions. 3 Volume Set..
A stout dark green nearly glabrous herb, with alternate pinnate large-stipuled leaves, the large red or purple flowers cymose or solitary, terminal or also axillary. Calyx deeply 5-lobed, 5-bracteolate, the bractlets narrow. Petals shorter than the calyx-lobes, acute, purple. Stamens numerous, inserted on the large pubescent disk. Pistils numerous, inserted on the somewhat enlarged, pubescent receptacle which becomes spongy in fruit. Style lateral. Achenes glabrous. Seed pendulous. [Greek name of the Arbutus, from the similar fruits.]
A monotypic genus of the north temperate zone.
Comarum palustre L. Sp. Pl. 502. 1753.
Potentilla palustris Scop. Fl. Cam. Ed. 2, 1: 359. 1772.
Decumbent and somewhat woody at the base, the upper part of the stems pubescent. Leaves pinnate, the lower long-petioled, 5 - 7 - foliolate; leaflets oblong or oval, sharply or incisely serrate, obtuse or acutish at the apex, narrowed at the base, 1' - 3' long; stipules membranous, sometimes adnate to the petiole for half its length; upper leaves nearly sessile, 3 - 5 - foliolate; flowers showy, 9" - 15" broad; calyx-lobes red or purple within, ovate, acuminate, much exceeding the ovate-lanceolate petals; bractlets much shorter than the calyx-lobes; disk lobed.
In swamps and peat-bogs, Greenland and Labrador to New Jersey, Iowa, British Columbia, Wyoming, Alaska and California. Northern Europe and Asia. Marsh five-finger. Meadow-nuts. Bog-strawberry. June-Aug.