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Polygonum heterosepalum : ウィキペディア英語版 | Polygonum heterosepalum
''Polygonum heterosepalum'', common name dwarf desert knotweed or oddsepal knotweed, is a plant species native to the Great Basin Desert in southwestern Idaho, northern Nevada, northeastern California, and southwestern Oregon. It has been reported from 1 county in California (Modoc), 4 in Nevada (Washoe, Humboldt, Elko and Lander), 4 in Idaho (Owyhee, Twin Falls, Elmore and Gooding), and 5 in Oregon (Lake, Malheur, Harney, Grant and Crook). The species occurs in dry, open sites in sagebrush plains and pine woodlands.〔〔(BONAP (Biota of North America Project) 2014 county distribution map )〕 ''Polygonum heterosepalum'' is a short herb up to tall, forming mats that seem rather moss-like. Stems are green or red. Leaves are densely packed, narrow up to long. Flowers are white, sometimes pink along margins, borne in groups of 2-3 in the axils of the leaves, slightly zygomorphic with some tepals longer than the others.〔(Flora of North America, M. Peck & Ownbey, 1950. Dwarf desert knotweed )〕〔(photo of isotype of ''Polygonum heterosepalum'' at Missouri Botanical Garden )〕〔Hitchcock, C. H., A.J. Cronquist, F. M. Ownbey & J. W. Thompson. 1984. Salicaceae to Saxifragaceae. Part II: 1–597. In C. L. Hitchcock Vascular Plants of the Pacific Northwest. University of Washington Press, Seattle.〕〔Peck, Morton Eaton & Ownbey, Francis Marion. 1950. Madroño 10(8): 250–251.〕 ==References==
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