Lemna valdiviana


Linnaea 33:239. 1864.

Synonyms: Lemna cyclostasa (Elliott) C. H. Thompson Lemna torreyi Austin
Treatment appears in FNA Volume 22. Treatment on page 149.

Roots to 1.5 cm, tip rounded to pointed; sheath not winged. Stipes white, small, often decaying. Fronds floating or (rarely) submersed, 1 or 2–few, coherent in groups, ovate to lanceolate, flat, thin, 1–5 mm, 1.3–3 times as long as wide, margins entire; veins 1, mostly prominent, longer than extension of air spaces, or running through at least 3/4 of distance between node and apex; with or without small papillae along midline of upper surface; anthocyanin absent; largest air spaces much shorter than 0.3 mm; turions absent. Flowers: ovaries 1-ovulate, utricular scale open on 1 side. Fruits 1–1.35 mm, not winged. Seeds with 15–29 distinct ribs. 2n = 40, 42.

Phenology: Flowering (very rare) spring–fall.
Habitat: Mesotrophic, quiet waters in temperate to tropical regions
Elevation: 0–2000 m


V22 455-distribution-map.jpg

Ala., Ariz., Ark., Calif., Conn., D.C., Fla., Ga., Ill., Ind., Kans., Ky., La., Md., Mass., Mich., Miss., Mo., Mont., Nebr., N.H., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Tex., Va., W.Va., Wyo., Mexico, West Indies (Bermuda), Central America, South America.


I know of no specimens of Lemna valdiviana from Delaware, but the species is to be expected there.

Selected References


Lower Taxa

... more about "Lemna valdiviana"
Elias Landolt +
Philippi +
Ala. +, Ariz. +, Ark. +, Calif. +, Conn. +, D.C. +, Fla. +, Ga. +, Ill. +, Ind. +, Kans. +, Ky. +, La. +, Md. +, Mass. +, Mich. +, Miss. +, Mo. +, Mont. +, Nebr. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, Tenn. +, Tex. +, Va. +, W.Va. +, Wyo. +, Mexico +, West Indies (Bermuda) +, Central America +  and South America. +
0–2000 m +
Mesotrophic, quiet waters in temperate to tropical regions +
Flowering (very rare) spring–fall. +
Weedy +  and Illustrated +
Lemna cyclostasa +  and Lemna torreyi +
Lemna valdiviana +
species +