Lemna valdiviana

Copyright: Flora of North America Association

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

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