Page authors: Don Knoke, David Giblin
Heteranthera dubia
grassleaf mud-plantain, water stargrass, yellow stargrass

Distribution: Occurring chiefly east of the Cascades crest along major rivers in Washington, however particularly common and rather invasives in lower Yakima River; British Columbia to California, widespread in eastern North America.

Habitat: River backwaters, slow-moving rivers, quiet streams, ponds and lakes.

Flowers: July-September

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Submersed to partially floating perennial with freely-rooting, weak stems.


Leaves alternate, stipulate, linear, 7-15 cm. long and 2-5 mm. broad.


Flowers solitary, pale yellow, subtended by a bract, at the water surface; perianth tube very slender, 2-4 cm. long, the 6 lobes alike, linear, 5-mm. long; stamens 3; style 1, with 3 entire stigmas; ovary superior, 1-celled, with 3 parietal placentae.


Capsule many-seeded.

Accepted Name:
Heteranthera dubia (Jacq.) MacMill.
Publication: Metasp. Minnesota Valley. 138. 1892.

Synonyms & Misapplications:
Zosterella dubia (Jacq.) Small [ILBC7]
Additional Resources:

PNW Herbaria: Specimen records of Heteranthera dubia in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Heteranthera dubia checklist entry.

E-Flora BC: Heteranthera dubia atlas page.

CalPhotos: Heteranthera dubia photos.

USDA Plants: Heteranthera dubia information.

31 photographs:
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