Lemna turionifera
turion duckweed

Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across much of North America to the Atlantic Coast; also in Eurasia.

Habitat: In standing or slow-moving fresh water.

Flowers: June-October

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Floating aquatic perennials forming colonies, lanceolate-ovate body 1-4 mm long, flat and barely gibbous, margins entire, often reddish below with coloring beginning where root is attached, sometimes red-spotted on upper surface; turions sometimes present; stipes small, white, usually decaying; roots less than 15 cm, tip generally rounded, sheath not winged.




Plants rarely found in flower, reproducing vegetatively; flowers 1-2 per body, surrounded by utricular scale with narrow opening at apex; stamens 2, 4-chambered, ovaries 1, containing 1 ovule, tapering into style, stigma funnel-shaped.


Fruit a follicle, 0.5-0.6 mm, not winged, opening by bursting; seeds 1-5, with 30-60 indistinct ribs.

Accepted Name:
Lemna turionifera Landolt
Publication: Aquatic Botany. 1: 355, fig. 4g–h. 1975.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Lemna turionifera in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Lemna turionifera checklist entry.

E-Flora BC: Lemna turionifera atlas page.

CalPhotos: Lemna turionifera photos.

USDA Plants: Lemna turionifera information.

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