''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
The Pacific Coast Ranges (officially gazetted as the Pacific Mountain System in the United States) are the series of mountain ranges that stretch along the West Coast of North America from Alaska south to Northern and Central Mexico. Although the ...
and northern Sierra Nevada
The Sierra Nevada () is a mountain range in the Western United States, between the Central Valley of California and the Great Basin. The vast majority of the range lies in the state of California, although the Carson Range spur lies primarily ...
). There are also isolated populations in central Idaho. It grows in high mountain habitat, such as talus and fellfields.Calflora taxon report, University of California, ''Aconogonon davisiae'' (W. H. Brewer ex A. Gray) Soják, Davis knotweed
/ref>
Description
''Koenigia davisiae'' is a perennial herb producing a decumbent or upright stem from a woody caudex
A caudex (plural: caudices) of a plant is a stem, but the term is also used to mean a rootstock and particularly a basal stem structure from which new growth arises.pages 456 and 695
In the strict sense of the term, meaning a stem, "caudex" is m ...
, growing to a maximum erect height near 40 centimeters (3 feet). Stems may be pale green to red in color. 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.[Flora of North America, ''Aconogonon davisiae'' (W. H. Brewer ex A. Gray) Soják, 1974. Davis's knotweed ]
/ref> In late summer to autumn, the leaves turn orange to red.[
]
References
External links
Jepson Manual Treatment - ''Polygonum davisiae''United States Department of Agriculture Plants Profile; ''Polygonum davisiae''''Polygonum davisiae'' - Calphotos Photo gallery, University of California
Polygonoideae
Flora of the Western United States
Plants described in 1872
Flora without expected TNC conservation status
{{Polygonaceae-stub