Page authors: David Giblin, Don Knoke
Aconogonon davisiae
Newberry's fleeceflower, Davis' knotweed, Davis's knotweed

Distribution: Occurring on both sides of the Cascades crest in Washington; Washington to California.

Habitat: Slopes and ridges in the subalpine and alpine.

Flowers: June-September

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Herbaceous perennial from a thick root, usually with several simple or freely branched stems, ascending to erect, about 1.5-3.5 dm. tall, more or less reddish-brown throughout.


Leaves numerous, alternate, only slightly reduced upward, short-petiolate, the blade broadly lanceolate to oblong, 2-5 cm. long; sheathing stipules brownish, 5-15 mm. long, not lacerate.


Inflorescence of short, few-flowered racemes in upper leaf axils; perianth greenish-white to pinkish, 3-4 mm. long with a stipe-like base, the 5 segments obovate; stamens 8, on short filaments.


Achene with three sharp angles, yellowish-brown, smooth and shining, about 4 mm. long.

Accepted Name:
Aconogonon davisiae (W.H. Brewer ex A. Gray) Soják
Publication: Preslia. 46: 151. 1974.

Synonyms & Misapplications:
Aconogonon davisiae (W.H. Brewer ex A. Gray) Soják var. davisiae [FNA5]
Aconogonon davisiae (W.H. Brewer ex A. Gray) Soják var. glabrum (G.N. Jones) S.P. Hong [FNA5]
Polygonum davisiae W.H. Brewer ex A. Gray [HC]
Polygonum newberryi Small [HC]
Polygonum newberryi Small var. glabrum G.N. Jones [HC]
Polygonum newberryi Small var. newberryi [HC]
Additional Resources:

PNW Herbaria: Specimen records of Aconogonon davisiae in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Aconogonon davisiae checklist entry

OregonFlora: Aconogonon davisiae information

E-Flora BC: Aconogonon davisiae atlas page

CalPhotos: Aconogonon davisiae photos

47 photographs:
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