| 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] | |
| |
Koenigia davisiae is aflowering plant in theknotweed family[1] that is known by the common namesDavis' knotweed orNewberry knotweed.
Koenigia davisiae is native to the western United States fromWashington,Oregon, and central and northernCalifornia (northernCoast Ranges and northernSierra Nevada). There are also isolated populations in centralIdaho. It grows in high mountain habitat, such astalus andfellfields.[2][3]
Koenigia davisiae is a deciduous perennial herb producing a decumbent or upright stem from a woodycaudex, 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. Leaf edges are entire or minutely toothed. At the base of each leaf is a thin reddish sheath formed from the leaf'sstipules which is known as theochrea.[4] In late summer to autumn, the leaves turn orange to red.[5]
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]
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