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Aconogonon davisiae

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About Davis' Knotweed (Aconogonon davisiae) Aconogonon davisiae is a species of flowering plant in the knotweed family known by the common name Davis' knotweed. 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. 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. 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.
Plant Description
Plant Type
Perennial herb

Max. Height
0.49 - 1.6 ft (0.15 - 0.49 m)

Flower Color
Yellow, Red

Native Status

Natural Setting
Elevation ?
4047' - 10530'

Annual Precip. ?
42.9" - 153.2"

Summer Precip. ?
1.40" - 5.58"

Coldest Month ?
14.4° F - 41.8° F

Hottest Month ?
37.0° F - 64.4° F

Humidity ?
1.47 vpd - 16.48 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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