Davis' knotweed facts for kids

Quick facts for kids Davis' knotweed
Scientific classification
Synonyms
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

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

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.

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.

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.