Page authors: David Giblin, Don Knoke
Alisma triviale
northern water plantain

Distribution: Widely distributed on both sides of the Cascades crest in Washington; Alaska to California, east across much of North America to the Atlantic Coast.

Habitat: Streams, lakes, ponds, wet ditches, wetlands, and cattle ponds.

Flowers: June-September

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bees, flies


Aquatic, scapose perennials, the scapes up to 12 dm. tall, longer than the leaves.


Leaves all basal, long-petiolate, the blades broadly lanceolate to ovate, 5-15 cm. broad, rounded to cordate at the base.


Flowers in much-compounded, bracteate, terminal panicles, the panicles branches in 2-6 whorles along the axis, the lower branches with 2 or more secondary branchlets or pedicles; sepals 3, 3-4 mm. long, greenish; petals 3, white, 4-6 mm. long; stamens 6, opposite the petals; pistils 10-20 in a single whorl; styles 0.4-0.8 mm. long, stout, slightly curved, somewhat lateral on the ovary, persistent.


Achenes obovate, 2.5-3 mm. long.

Accepted Name:
Alisma triviale Pursh
Publication: Flora Americae Septentrionalis. 1: 252. 1814.

Synonyms & Misapplications:
Alisma plantago-aquatica L. var. americanum Schult. & Schult. f. [HC]
Additional Resources:

PNW Herbaria: Specimen records of Alisma triviale in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Alisma triviale checklist entry

OregonFlora: Alisma triviale information

E-Flora BC: Alisma triviale atlas page

CalPhotos: Alisma triviale photos

74 photographs:
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