Sulfur cinquefoil flowers from early May to July.
Potentilla rectaroughfruit cinquefoilsulfur cinquefoil
Species: P. recta
Each flower is about ¾" across, consisting of 5 pale yellow to yellow petals, 5 hairy green sepals, 25 to 30 stamens with yellowish anthers, and a bright yellow receptacle with numerous pistils.
The plant flowers mid-summer, with the blooms lasting about a month.