Davis' knotweed

Aconogonon davisiae

''Aconogonon davisiae'' is an unresolved species name for a flowering plant in the knotweed family that is known by the common names Davis' knotweed or Newberry knotweed.
Davis' knotweed  Aconogonon davisiae,Geotagged,Summer,United States

Appearance

''Aconogonon davisiae'' is a perennial herb producing a decumbent or upright stem from a woody caudex, growing to a maximum erect height near 40 centimeters. 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.

Distribution

''Aconogonon davisiae'' is native to the western United States from Washington, Oregon, and central and northern California . There are also isolated populations in central Idaho It grows in high mountain habitat, such as talus and fellfields.

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Taxonomy
KingdomPlantae
DivisionAngiosperms
ClassEudicots
OrderCaryophyllales
FamilyPolygonaceae
GenusAconogonon
SpeciesA. davisiae