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Potentilla Recta L WRITTEN FINDINGS OF THE WASHINGTON STATE NOXIOUS WEED CONTROL BOARD (December 1994; 1998) Scientific Name: Potentilla recta L. Common Name: Sulfur cinquefoil Family: Rosaceae Legal Status: Class B (a) regions 1,3,8,10. (b) region 2 except Skagit Co. (c) region 4 except Stevens, Ferry and Pend Orielle Counteis. (d) region 5 except Thurston Co. (e) region 6 except Yakima Co. (f) region 7 except Spokane Co. (g) region 8 except Lewis Co. (h) region 9 except Klickitat Co. Description and Variation: Sulfur cinquefoil is a perennial species with a woody rootstock producing several erect stems, which can reach one to three feet in height. The stout, leafy, hairy stems are unbranched up to the inflorescence. The leaves, which are also rough-hairy, have five to seven toothed, palmately arranged leaflets that are 2-4 inches long by 1/2-1 inch wide. The flat- topped inflorescences are 3-6 inches across, and each flower has five light yellow petals surrounding a dark yellow center. The fruits are achenes, which are dark brown, with lighter, prominent, branched ridges, and narrow, winged margins (Callihan et al. 1991; Werner and Soule 1976). Economic Importance: Detrimental - Although not a serious agricultural weed, it can form monocultures over large areas of rangeland, roadside, waste places, and unworked fields, where it is not easily controlled by mowing (Werner and Soule 1976). Sulfur cinquefoil is a strong competitor that reduces grass production on many rangeland sites (Rice et al. 1991). Because of its high tannin content, sulfur cinquefoil is unpalatable to most wildlife and livestock. In areas where sulfur cinquefoil grows with spotted knapweed, cattle will graze the knapweed over the cinquefoil (Rice et al 1991). Beneficial - Sulfur cinquefoil may help bind soil on poor sites (Werner and Soule 1976). Geographic Distribution: A native of Eurasia, sulfur cinquefoil is found in central and southern Europe, the Middle East, the mountains of north Africa, and western and central Asia. In North America, the species reaches from Georgia in the southeast to Oregon, Washington, and southern British Columbia. (Werner and Soule 1976). 1 Habitat: The species is adapted to a wide range of environmental conditions. It occurs in open grasslands, shrubby areas, open forest and logged areas, roadsides, waste areas, and abandoned fields. In abandoned fields, sulfur cinquefoil occurs in the earliest stages of succession until woody cover is present; it also grows forest margins, but it cannot survive under a full forest canopy (Werner and Soule 1976). History: Sulfur cinquefoil was brought to North America from Europe, sometime before 1900. The exact date and location of the original introduction is not known (Werner and Soule 1976). By 1950, the plant was well established in the eastern U.S. and Canada, and the Great Lakes region. The plant spread west, and, by 1976, it was reported from Washington, Oregon, British Columbia, Alberta. Growth and Development: Sulfur cinquefoil is a perennial that regenerates annually via new shoots emerging from the edges of the root mass; the central core of this mass slowly disintegrates. Therefore, long-lived plants consist of a circle of upright stems surrounding a core of old stems and leaves. The species flowers from June through July (Hitchcock and Cronquist 1961). There is some evidence that suggests that sulfur cinquefoil has the potential to form a persistent seed bank (Baskin and Baskin 1990). Reproduction: This species reproduces by seed, but it can be spread by roots if they are moved by tillage or on soil-moving equipment (Callihan et al. 1991). Response to Herbicides: Tordon (picloram) and 2,4-D Ester both provide effective control of cinquefoil without harming grasses (if applied at recommended rates). Ally (metsulfuron) will also control cinquefoil but may cause grass injury. Sulfur cinquefoil will re-establish within three to four years of herbicide treatment, so repeated applications would be needed for long-term herbicide control (Rice et al. 1991). Response to Mechanical Methods: In productive areas, cultivation with annual crops will control sulfur cinquefoil. Hand pulling or chopping is also effective if care is taken to remove the root crown. Because the massive, woody root system stores extensive food reserves, mowing is not an effective control measure; the roots send up new shoots after mowing (Rice et al. 1991). Biocontrol Potentials: Forty-seven species of insects are associated with sulfur cinquefoil in the northeastern U.S. These insects need to be investigated for biocontrol potential. However, because of the close genetic relationship between cinquefoils and strawberries, there is concern with bioagents attacking non-target plants (Batra 1979). References: *Baskin, J.M. and C.C. Baskin. 1990. Role of temperature and light in the germination ecology of buried seeds of Potentilla recta. Annals of Applied Ecology 117: 611-616. 2 *Batra, S.W.T. 1979. Insects associated with weeds in the Northeastern United States. II. Cinquefoils, Potentilla norvegica and Potentilla recta (Rosaceae). Journal of the New York Entomological Society 87: 216-222. *Callihan, R.H., R.R. Old, and R.S. Burnworth. 1991. Sulfur cinquefoil. Pacific Northwest Extension Bulletin 376 *Hitchcock, C.L. and A. Cronquist. 1961. Vascular Plants of the Pacific Northwest. Part 3: Saxifragaceae to Ericaceae. University of Washington Press, Seattle. *Rice, P.M., C.A. Lacey, J.R. Lacey, and R. Johnson. 1991. Sulfur cinquefoil biology, ecology and management in pasture and rangeland. Montana State University Extension Bulletin 109. Montana State University, Bozeman. *Werner, P.A. and L.D. Soule. 1976. The biology of Canadian weeds. 18. Potentilla recta L., Potentilla norvegica L., and Potentilla argentea L. Canadian Journal of Plant Science 56: 591-603. *References available from the Washington State Noxious Weed Control Board office in Kent. 3.
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