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..
Not Adans. 1763.]
Perennial glandular herbs, with unequally pinnate leaves and cymose flowers. Calyx-tube short and broad. Bractlets, calyx-lobes and petals 5. Petals neither clawed nor emar-ginate. Stamens 20-30, in 5 clusters on the thickened margin of the 5-angled disc; filaments filiform; anthers flat. Receptacle hemispheric or somewhat elongated, bearing numerous pistils. Style nearly basal; stigma minute. Seed orthotropous, ascending. [Greek, woodland beauty.]
About 30 species, natives of the north temperate and subarctic zone. Besides the following, some 25 others occur in western North America. Type species: Drymocallis rubricaulis Fourr.
1814. Potentilla arguta Pursh, Fl. Am. Sept. 736. 1814. Drymocallis agrimonioides Rydb. N. A. Fl. 22:
Erect, stout, simple or little-branched above, glandular and villous-pubescent, 1°-4° high. Stipules membranous; basal leaves slender-petioled, pinnately 7 - 11 - foliolate; leaflets ovate, oval or rhomboid, obtuse at the apex, the terminal one cuneate, the others rounded at the base and commonly oblique, all sharply incised-dentate; stem-leaves short-petioled or sessile, with fewer leaflets; flowers white, densely cymose, terminal, numerous, short-pedicelled, 5" - 7" broad; calyx-lobes ovate, acute, shorter than the obovate petals; stamens 25 - 30, borne on the glandular disk; style nearly basal and fusiform-thickened; achenes glabrous.
On dry or rocky hills, New Brunswick to Mackenzie, south to Virginia, Illinois, Kansas and Colorado. June-July.