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.[1][2]

Polygonum heterosepalum
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Polygonaceae
Genus: Polygonum
Species:
P. heterosepalum
Binomial name
Polygonum heterosepalum
M.Peck & Ownbey 1950

Polygonum heterosepalum is a short herb up to 5 centimetres (2.0 in) tall, forming mats that seem rather moss-like. Stems are green or red. Leaves are densely packed, narrow up to 3 millimetres (0.12 in) 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.[1][3][4][5]

References
  1. Flora of North America, M. Peck & Ownbey, 1950. Dwarf desert knotweed
  2. BONAP (Biota of North America Project) 2014 county distribution map
  3. photo of isotype of Polygonum heterosepalum at Missouri Botanical Garden
  4. 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.
  5. Peck, Morton Eaton & Ownbey, Francis Marion. 1950. Madroño 10(8): 250–251.
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