Page authors: Don Knoke, David Giblin
Lobelia dortmanna
water lobelia

Distribution: Occurring west of the Cascades crest in Washington; Alaska to Oregon; circumboreal.

Habitat: In shallow water at the margins of ponds and lakes.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Sensitive in Washington (WANHP)

Pollination: Hummingbirds


Aquatic, perennial herbs with fibrous roots, the stems hollow, upright, simple, up to 1 m. tall, the herbage glabrous throughout.


Basal leaves in a rosette, linear, fleshy, hollow, curved, 2-8 cm. long; cauline leaves few, reduced to filiform bracts.


Flowers few and well-spaced, single on curved pedicels; calyx lobes 5, deltoid, blunt, 1.5-2.5 mm. long; corolla two-lipped, pale blue or white, 1-2 cm. long, the lower lip deeply 3-lobed, the tube deeply split between the two upper lobes; filaments and anthers united into a tube, with two anthers shorter than the other three; ovary inferior.


Capsule 2-celled, ellipsoid, 5-10 mm. long and 3-5 mm. wide.

Accepted Name:
Lobelia dortmanna L.
Publication: Sp. Pl. 2: 929. 1753.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Lobelia dortmanna in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Lobelia dortmanna checklist entry

OregonFlora: Lobelia dortmanna information

E-Flora BC: Lobelia dortmanna atlas page

CalPhotos: Lobelia dortmanna photos

5 photographs:
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