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Other Names: Klamath weedScientific Name: Hypericum boreale (Britt.) Bickn.
Plant Family: Guttiferae
Botanical Description: herbaceousStems: slender, tough, 6 - 10 inches tall
Leaves: attached without petiole stems in opposite pairs, elliptic or oval, covered with small, clear dots
Roots: system branched and extending to considerable depth, reproductive rootstocks shallow and extending several inches from crown
Flowers: about 0.75 inch diameter, five-petaled, yellow or orange-yellow, may have black dots along edges of petals
Seeds: Seed pods are pointed, rounded, with three parts and many seeds. Seeds are 1/16 inch long, cylindrical, blackish, shiny with a rough, pitted, resinous surface.
Seedling: Seed leaves are tiny with three veins meeting in the short stalk. Subsequent leaves are opposite, thin and papery, with fine granules on upper surface. Later leaves are covered with small, clear dots, often with black glands on the underside along the edges. Stem is slender but very tough.
Reproduction: perennialPropagation: seed and rootstocks
Dispersal: Both seeds and rootstocks are introduced into new cranberry beds with vine cuttings.
State:National: Found in many places throughout U.S. except extreme north and south.
Origin: native of Europe
Very prolific. Tends to prefer soils with pH near 6.0. Very common invader as a seedling in new plantings and patches of weakened vines. Does not persist in competition with healthy cranberries. Common in pastures, meadows, rangelands, and along roadsides.
While scouting a cranberry bed for disease and insect pests, identify weed populations as they arise. Note the specie(s) of weed present as well as the population level relative to field area. Example: 20% northern st. johnswort, 20% boneset and joe-pye weed mix.
Dana, M. 1987. Cranberry Weeds in Wisconsin. Department of Horticulture, University of Wisconsin-Madison. Madison, Wisconsin. p. 21.
Kummer, A. P. 1951. Weed Seedlings. The University of Chicago Press, Chicago, U.S.A. p. 182.
Kummer, L. D., T. G. Dittl, and T. D. Planer. 1993. Wisconsin Cranberry Weeds. Wisconsin Cranberry Board, Wisconsin Rapids, Wisconsin. p. 6.
Lorenzi, H. J. and L. S. Jeffery. 1987. Weeds of the United States and Their Control. Van Nostrand Reinhold Company, New York, New York. p. 211.
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