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Potentilla rivalis  Nutt.
Ellsworth County, Kansas
Annual, biennial, or perennial
Height: 8-28 inches
Family: Rosaceae - Rose Family
Flowering Period:   May, June, July, August, September
Also Called: River cinquefoil.
Stems: Decumbent to ascending or erect, branched from base, glabrate or soft-pubescent to villous.
Leaves: Alternate, cauline; stipules ovate to lanceolate, 1/4 to 1/2 inch; petiole 0 to 2.4 inches; blade pinnately or palmately compound; leaflets 3-5, obovate to oblanceolate or oblong, 2/5 to 2 inches long, 1/5 to 1 inch wide, margins crenate-serrate, tip blunt, lower surface pubescent to villous, upper surface glabrous.
Inflorescences: Mostly terminal, 15-30-flowered cymes
Flowers: Pedicels 0 to 1 inch; bractlets immediately subtending the calyx 5, elliptic, 1/12 to 1/4 inch; sepals 5, ovate-triangular, 1/12 to 1/8 inch; petals 5, pale yellow, cuneate-obovate to oblanceolate, 1/20 to 1/8 inch; stamens (5)-10(-15).
Fruits: Achenes yellowish brown, ca. 1/32 inch, usually smooth, sometimes rugose, without corky appendage along inner margin.
Habitat: Shores of ponds and lakes, river and stream banks, marshes, ditches, and swales
Distribution: Scattered throughout Kansas
Origin: Native
Comments: Potentilla, potent and little, alluding to the medicinal properties of some species and rivalis, of brooksides.

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