Page authors: Don Knoke, David Giblin
Damasonium californicum
fringed water plantain, star water plantain

Distribution: Known only from Klickitat County in Washington; Washington to California, east to southwest Idaho and western Navada.

Habitat: Sloughs, ditches and marshy fields.

Flowers: June-July

Origin: Native

Growth Duration: Perennial

Conservation Status: Threatened in Washington (WANHP)

Pollination: Moths, self-pollination


Aquatic, herbaceous, scapose perennials 2-4 dm. tall from a rhizome, the leaves about equaling the inflorescence.


Leaves clustered on the short rhizome, long-petiolate, the blades linear to oblong-lanceolate, rounded or tapering at the base, 3-5 cm. long, erect to floating.


Inflorescence a simple, involucrate umbel or a panicle of 2 to 4 whorles of flowers; pedicles 2-6 cm. long, spreading to recurved; sepals 3, 4-5 mm. long, greenish, persistent; petals 3, 7-10 mm. long, white to pink, spreading, fringed, deciduous; stamens 6, opposite the petals; pistils 9-15, in a single whorl.


Achenes flattened, divergent, strongly ribbed on each margin and depressed between, the body about 4 mm. long with an erect beak of equal length.

Accepted Name:
Damasonium californicum Torr.
Publication: Plantas Hartwegianas imprimis Mexicanas. .. 341. 1857.

Synonyms & Misapplications:
Machaerocarpus californicus (Torr.) Small [HC]
Additional Resources:

PNW Herbaria: Specimen records of Damasonium californicum in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Damasonium californicum checklist entry

OregonFlora: Damasonium californicum information

E-Flora BC: Damasonium californicum atlas page

CalPhotos: Damasonium californicum photos

12 photographs:
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