Lemna trisulca

Linnaeus

Sp. Pl. 2: 970. 1753.

Common names: Lenticule trisulquée
WeedyIllustrated
Treatment appears in FNA Volume 22. Treatment on page 148.

Roots to 2.5 cm (sometimes not developed), tip pointed; sheath not winged. Green stalks 2–20 mm. Fronds submersed (except when flowering or fruiting), 3–50, coherent and very often forming branched chains, narrowly ovate, flat, thin, 3–15 mm (excluding stalk), 2–3.5 times as long as wide, base suddenly narrowed into green stalk, margins denticulate distally; veins (1 or) 3, lateral-veins only in proximal part of frond; papillae absent; anthocyanin often present; air spaces shorter than 0.3 mm; turions absent. Flowers: ovaries 1-ovulate, utricular scale with narrow opening at apex. Fruits 0.6–0.9 mm, laterally winged toward apex. Seeds with 12–18 distinct ribs, staying within fruit wall after ripening. 2n = 40, 42, 44, 60, 63, 80.


Phenology: Flowering (rare) late spring–summer.
Habitat: Mesotrophic, quiet waters rich in calcium, in cool-temperate regions
Elevation: 0–3000 m

Distribution

V22 187-distribution-map.jpg

Alta., B.C., Man., N.B., N.W.T., N.S., Nunavut, Ont., P.E.I., Que., Sask., Yukon, Alaska, Ariz., Ark., Calif., Colo., Conn., Idaho, Ill., Ind., Iowa, Kans., Maine, Md., Mass., Mich., Minn., Mo., Mont., Nebr., Nev., N.H., N.J., N.Mex., N.Y., N.Dak., Ohio, Oreg., Pa., R.I., S.Dak., Tenn., Utah, Vt., Va., Wash., W.Va., Wis., Wyo., nearly worldwide, except arctic and antarctic regions and South America, in warm regions only in mountains

Discussion

The report of Lemna trisulca in Florida is dubious because the climate is too warm. The species may be temporarily introduced there by birds.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Lemna trisulca"
80 +, 63 +, 60 +, 44 +, 42 +  and 40 +
Elias Landolt +
Linnaeus +
narrowed +
small green +
Lenticule trisulquée +
Alta. +, B.C. +, Man. +, N.B. +, N.W.T. +, N.S. +, Nunavut +, Ont. +, P.E.I. +, Que. +, Sask. +, Yukon +, Alaska +, Ariz. +, Ark. +, Calif. +, Colo. +, Conn. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, Nebr. +, Nev. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.Dak. +, Ohio +, Oreg. +, Pa. +, R.I. +, S.Dak. +, Tenn. +, Utah +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Wyo. +, nearly worldwide +, except arctic and antarctic regions and South America +  and in warm regions only in mountains +
0–3000 m +
coherent +
submersed +
3 +  and 50 +
0.3 cm3 mm <br />0.003 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
not differentiated +
0.06 cm0.6 mm <br />6.0e-4 m <br /> (0.09 cm0.9 mm <br />9.0e-4 m <br />) +
Mesotrophic, quiet waters rich in calcium, in cool-temperate regions +
denticulate +
tapering +  and bottle--shaped +
Flowering (rare) late spring–summer. +
distinct +
0 cm0 mm <br />0 m <br /> (2.5 cm25 mm <br />0.025 m <br />) +
membranous +
Weedy +  and Illustrated +
0.2 cm2 mm <br />0.002 m <br /> (2 cm20 mm <br />0.02 m <br />) +
distinct +
funnel--shaped +
Lemna trisulca +
species +
pointed +
submersed +  and floating +
22 +, 21 +  and 10 +