Lemna minuta
least duckweed

Distribution: Occurring chiefly west of the Cascades crest and in the Columbia River Gorge in Washington; southwestern British Columbia to California, east across the U.S. in scattered locations to the Atlantic Coast.

Habitat: Floating on surface of calm water or on face of vertical rock seeps.

Flowers: June-September

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Floating aquatic perennials forming colonies, lanceolate-ovate body 0.8-4 mm long, flat to somewhat thick, margins entire; stipes small, white, usually decaying; roots to 1.5 cm, tip rounded or pointed, sheath not winged.




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


Fruit a follicle, 0.6-1 mm, not winged, opening by bursting; seeds 1-5, with 12-15 distinct ribs.

Accepted Name:
Lemna minuta Kunth
Publication: Nov. Gen. Sp. 1: 372. 1816.

Synonyms & Misapplications:
Lemna minima Phil., invalid name [Abrams]
Lemna minuscula Herter [JPM]
Additional Resources:

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

WA Flora Checklist: Lemna minuta checklist entry.

E-Flora BC: Lemna minuta atlas page.

CalPhotos: Lemna minuta photos.

USDA Plants: Lemna minuta information.

1 photographs:
Group by