Koenigia davisiae

Koenigia davisiae is a flowering plant in the knotweed family[1] that is known by the common names Davis' knotweed or Newberry knotweed.

Koenigia davisiae
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Polygonaceae
Genus: Koenigia
Species:
K. davisiae
Binomial name
Koenigia davisiae
Synonyms[1]
  • Aconogonon davisiae (W.H.Brewer ex A.Gray) Soják
  • Aconogonon davisiae var. glabrum (G.N.Jones) S.P.Hong
  • Aconogonon newberryi (Small) Soják
  • Polygonum davisiae W.H.Brewer ex A.Gray
  • Polygonum newberryi Small
  • Polygonum newberryi var. glabrum G.N.Jones

Distribution

Koenigia davisiae is native to the western United States from Washington, Oregon, and central and northern California (northern Coast Ranges and northern Sierra Nevada). There are also isolated populations in central Idaho. It grows in high mountain habitat, such as talus and fellfields.[2][3]

Description

Koenigia davisiae is a perennial herb producing a decumbent or upright stem from a woody caudex, growing to a maximum erect height near 40 centimeters (3 feet). The leaves are oval and pointed or widely-lance-shaped to somewhat triangular, yellowish or pale green and waxy, slightly hairy, or smooth in texture. At the base of each leaf is a thin reddish sheath formed from the leaf's stipules which is known as the ochrea.[4]

Flowers occur in clusters of 2 to 5 in the leaf axils. The flowers are yellowish, greenish, or purple-tinged and just a few millimeters wide.[4]

References
  1. "Koenigia davisiae (W.H.Brewer ex A.Gray) T.M.Schust. & Reveal". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2019-02-24.
  2. Biota of North America Program 2014 county distribution map
  3. Calflora taxon report, University of California, Aconogonon davisiae (W. H. Brewer ex A. Gray) Soják, Davis knotweed
  4. Flora of North America, Aconogonon davisiae (W. H. Brewer ex A. Gray) Soják, 1974. Davis's knotweed


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