Silver-weed—Argentina Anserina.
Alpine Avens—Dryas octopetala.
There are many kinds of Cinquefoils, mostly natives of the north temperate zone, usually herbs, with compound leaves and yellow, white or purple flowers, always with pedicels; the flat or cup-shaped calyx, with five, main teeth, alternating with five, tooth-like bractlets; petals five, broad, often notched; stamens numerous, with threadlike filaments and small anthers, near the base of the calyx-cup; pistils numerous, on the conical, hairy receptacle, which does not become fleshy or juicy, each pistil maturing into a dry, seed-like akene. Potentilla means "powerful," as some sorts are medicinal. They often resemble Buttercups, but never have shiny petals, and Buttercups do not have bractlets between the calyx-lobes.
Arctic Cinquefoil
Potentílla emarginàta
Yellow
Summer
Northwest
A dear little plant, forming low tufts, two or three inches high, with thin, brownish stipules, bright green leaves, more or less hairy, and bright yellow flowers, deeper in color towards the center and about half an inch across. This grows in high northern mountains across the continent and in Siberia.
Silky Cinquefoil
Potentílla pectinisécta
Yellow
Spring, summer
Utah, Ariz., Wyo.
The foliage of this plant is a lovely shade of silvery gray, which suits the yellow flowers. It has several stoutish, reddish, stems, a foot to a foot and a half tall, springing from clumps of leaves, with long leaf-stalks and five to seven leaflets. The bright-yellow flowers are each three-quarters of an inch across and the whole plant is conspicuously covered with long, thick, white, silky down, particularly on the under side of the leaves.
Shrubby Cinquefoil
Dasíphora fruticòsa
(Potentilla)
Yellow
Spring, summer
West, etc.
This is the only kind of Dasiphora, a pretty shrub, very branching and leafy, one to four feet high, dotted all over with charming flowers. The bark is shreddy and the gray-green leaves are covered with silky down, with rolled back margins, and paler on the under side. The flowers, single or in clusters, are over an inch across, with clear yellow petals and deeper yellow anthers. This is common in the mountains, across the continent, up to an altitude of ten thousand feet, and is a troublesome weed in northern New England. It is also found in Europe and Asia.
Arctic Cinquefoil—P. emarginata.
Shrubby Cinquefoil—Dasiphora fruticosa.
Silky Cinquefoil—Potentilla pectinisecta.