Potentilla recta L.
Potentilla recta L. var. obscura (Nestler) W.D.J. Koch
Potentilla recta L. var. pilosa (Willd.) Ledeb.
Potentilla recta L. var. sulphurea (Lam. & DC.) Peyr.
Rough-fruited Cinquefoil, Sulphur Cinquefoil
Rough-fruited cinquefoil is a Eurasian native. It was introduced to North America prior to 1900, and it has become widespread. It is considered a noxious weed in some localities.
Identification: Plants are up to 20" (50 cm) high, with hairy stems and palmlike leaf clusters. Each cluster has five to seven hairy leaflets, each 2-4" (5-10 cm) × ½-1" (1.3-2.5 cm), with many small teeth. Flowers have five petals and are about ½" (1.5 cm) in diameter. They are cream-colored, pale yellow, or yellow, with a yellow center and black spots on the anthers. Fruits are dark brown achenes (dried fruits) with branched ridges, hence the name “rough-fruited.”
This cinquefoil is found in grasslands, shrubby areas, open forest, roadsides, abandoned fields, and waste areas.
Potentilla recta on Missouriplants.com
Potentilla recta on the Connecticut Botanical Society's Connecticut wildflowers site
Potentilla recta at Illinois Wildflowers
Potentilla recta at Minnesota Wildflowers
Potentilla recta at the Colorado Weed Management Association
Potentilla recta on the USDA Forest Service's Fire Effects Information Database
Potentilla recta on the Virginia Tech Weed Identification Guide
Potentilla recta on Plants for a Future, a resource and information centre for edible and otherwise useful plants
Potentilla recta description by Thomas H. Kent, last updated 17 Jun 2016.