Aconogonon davisiae
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| File:Polygonumdavisiae.jpg | |
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A. davisiae
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| Aconogonon davisiae |
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Aconogonon davisiae is an unresolved species name[1] for a flowering plant in the knotweed family that is known by the common names Davis' knotweed or Newberry knotweed.
Distribution
Aconogonon 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
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 (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
- ↑ Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Biota of North America Program 2014 county distribution map
- ↑ Calflora taxon report, University of California, Aconogonon davisiae (W. H. Brewer ex A. Gray) Soják, Davis knotweed
- ↑ 4.0 4.1 Flora of North America, Aconogonon davisiae (W. H. Brewer ex A. Gray) Soják, 1974. Davis's knotweed
External links
- Jepson Manual Treatment - Polygonum davisiae
- United States Department of Agriculture Plants Profile; Polygonum davisiae
- Polygonum davisiae - Calphotos Photo gallery, University of California
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