Page authors: Don Knoke, David Giblin
Hydrocotyle ranunculoides
floating marsh-pennywort

Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to California, east to the Atlantic coast.

Habitat: Marshes, ponds and wet ground.

Flowers: April-July

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bees


Low perennials, the stems floating or creeping, with well-developed internodes, rooting at the nodes.


Petioles elongate, weak, 0.5-3.5 dm. long; leaf blades rotund-reniform, with an evident basal sinus, 1-6 cm. wide, 5- or 6-lobed to about the middle, the lobes with a few broad teeth.


Inflorescence a simple umbel, 5-10 flowered, the pedicels 1-3 mm. long; peduncles axillary, much shorter than the petioles, 1-5 cm. long, recurved in fruit; petals 5, greenish-white.


Fruit sub-orbicular, 1-3 mm. long and 2-3 mm. wide, the dorsal surface rounded, the ribs obsolete.

Accepted Name:
Hydrocotyle ranunculoides L. f.
Publication: Suppl. Pl. 177. [1782]. 1781.

Synonyms & Misapplications:
Hydrocotyle cymbalarifolia Muhl.
Additional Resources:

PNW Herbaria: Specimen records of Hydrocotyle ranunculoides in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Hydrocotyle ranunculoides checklist entry

OregonFlora: Hydrocotyle ranunculoides information

E-Flora BC: Hydrocotyle ranunculoides atlas page

CalPhotos: Hydrocotyle ranunculoides photos

23 photographs:
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