Spirodela polyrrhiza

(Linnaeus) Schleiden
Linnaea 13: 392. 1839.
Common names: Spirodèle polyrhize
Basionym: Lemna polyrrhiza Linnaeus Sp. Pl. 2: 970. 1753 (as polyrhiza)
Treatment appears in FNA Volume 22. Treatment on page 145.

Roots 7–21, to 3 cm, 1 or 2 perforating scale. Fronds obovate to circular, flat or rarely gibbous, 2–10 mm, 1–1.5 times as long as wide, apex rounded or pointed, upper surface sometimes with red spot in center; veins 7–16(–21); turions sometimes present, rootless, brownish olive, circular-reniform, 1–2 mm diam. Flowers: ovaries 1–2-ovulate. Fruits 1–1.5 mm, laterally winged to apex. Seeds with 12–20 distinct ribs. 2n = 30, 38, 40, 50, 80.


Phenology: Flowering (very rare) early summer–early fall.
Habitat: Eutrophic, quiet waters, in temperate to tropical regions
Elevation: 0–2500 m

Distribution

V22 401-distribution-map.jpg

Alta., B.C., Man., N.B., N.S., Ont., P.E.I., Que., Sask., Ala., Ariz., Ark., Calif., Colo., Conn., Del., D.C., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.C., S.Dak., Tenn., Tex., Utah, Vt., Va., Wash., W.Va., Wis., Wyo., nearly worldwide.

Discussion

Selected References

None.

Lower Taxa

None.

... more about "Spirodela polyrrhiza"
Elias Landolt +
(Linnaeus) Schleiden +
Lemna polyrrhiza +
Spirodèle polyrhize +
Alta. +, B.C. +, Man. +, N.B. +, N.S. +, Ont. +, P.E.I. +, Que. +, Sask. +, Ala. +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Del. +, D.C. +, Fla. +, Ga. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Mont. +, Nebr. +, Nev. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, N.Dak. +, Ohio +, Okla. +, Oreg. +, Pa. +, R.I. +, S.C. +, S.Dak. +, Tenn. +, Tex. +, Utah +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Wyo. +  and nearly worldwide. +
0–2500 m +
Eutrophic, quiet waters, in temperate to tropical regions +
Flowering (very rare) early summer–early fall. +
Spirodela polyrrhiza +
Spirodela +
species +