Lemna valdiviana

Philippi

Linnaea 33:239. 1864.

WeedyIllustrated
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

Distribution

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

Discussion

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

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Lemna valdiviana"
Elias Landolt +
Philippi +
small green +
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 +
coherent +
submersed +  and floating +
1-or-2-few +
ovate +  and lanceolate +
0.1 cm1 mm <br />0.001 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
not differentiated +
0.1 cm1 mm <br />0.001 m <br /> (0.135 cm1.35 mm <br />0.00135 m <br />) +
Mesotrophic, quiet waters in temperate to tropical regions +
denticulate +  and entire +
tapering +  and bottle--shaped +
Flowering (very rare) spring–fall. +
distinct +
0 cm0 mm <br />0 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
membranous +
Weedy +  and Illustrated +
distinct +
funnel--shaped +
Lemna cyclostasa +  and Lemna torreyi +
Lemna valdiviana +
species +
rounded +  and pointed +
submersed +  and floating +
22 +, 21 +  and 10 +