Page authors: Tanya Harvey, David Giblin
Utricularia intermedia
flat-leaved bladderwort, mountain bladderwort

Distribution: Occurring on both sides of the Cascades crest in Washington; circumboreal; widely distributed throughout North America except in Central Plains, Gulf Coast, and Southeast.

Habitat: Shallow, standing or slowly moving water.

Flowers: July-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Sensitive in Washington (WANHP)


Submersed plants with very slender stems, commonly creeping along the bottom.


Leaves numerous, alternate, 0.5-2 cm. long, 3-parted and the base, then 1-3 times dichotomous, the segments slender and flat, the ultimate ones blunt; specialized branches distinct from the leaves bear bladders 2-4 mm. wide.


Flowers 2-4 in a lax raceme at the end of an emergent peduncle 6-20 cm. long; calyx deeply 2-lobed, the lobes entire; corolla bilabiate, yellow, the proper tube very short, the spur 8-12 mm. long; upper lip entire, half as long as the lower; lower lip nearly entire, about as long as the spur, the base prominently raised; stamens 2, ovary superior.


Capsule on an erect pedicel.

Accepted Name:
Utricularia intermedia Hayne
Publication: J. Bot. (Schrader) 1(1): 18. 1800.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Utricularia intermedia in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Utricularia intermedia checklist entry

OregonFlora: Utricularia intermedia information

E-Flora BC: Utricularia intermedia atlas page

CalPhotos: Utricularia intermedia photos

36 photographs:
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