Page authors: Ben Legler, David Giblin
Limosella aquatica
awl-leaf mudwort

Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the northern Great Plains and further eastward to northeastern North America.

Habitat: In shallow water or wet mud of rivers, lakes, and ponds at low to middle elevations.

Flowers: June-October

Origin: Native

Growth Duration: Annual, Perennial

Conservation Status: Not of concern


Tiny, glabrous, scapose perennial, with fibrous roots from a small crown.


Leaves all basal, entire, the blades narrowly elliptic, 5-18 mm. long and 2-7 mm. wide, with long, slender petioles, up to 8 cm. long.


Flowers usually solitary on long, slender, lax scapes, or sometimes in a cluster on short pedicels, in a whorl of leaves at the top of a naked stem; calyx 5-toothed, 2-3 mm. high; corolla white or pinkish, inconspicuous, the tube about equal to the calyx, the 5 lobes short and spreading; stamens 4; stigma capitate.


Capsule 2-3.5 mm. high, 1-celled toward the tip.

Accepted Name:
Limosella aquatica L.
Publication: Sp. Pl. 2: 631-632. 1753.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Limosella aquatica in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Limosella aquatica checklist entry.

E-Flora BC: Limosella aquatica atlas page.

CalPhotos: Limosella aquatica photos.

USDA Plants: Limosella aquatica information.

32 photographs:
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