Lemna perpusilla

Torrey

Fl. New York 2: 245. 1843.

Common names: Lenticule très petite
WeedyIllustratedEndemic
Treatment appears in FNA Volume 22. Treatment on page 149.

Roots to 3.5 cm, tip usually sharp pointed; sheath narrowly winged at base (wing 2–3 times as long as wide). Stipes white, small, often decaying. Fronds floating, 1 or 2–few, coherent in groups, ovate-obovate, flat, 1–4 mm, 1–1.7 times as long as wide, margins entire; veins 3, greatest distance between lateral-veins near or distal to middle; 1 distinct papilla near apex on upper surface, 2–3 very distinct papillae above node; anthocyanin absent, no reddish color; air spaces much shorter than 0.3 mm; distinct turions absent. Flowers: ovaries 1-ovulate, utricular scale open on 1 side. Fruits 0.7–1 mm, not winged. Seeds with 35–70 indistinct ribs, staying within fruit wall after ripening. 2n = 40 (U), 42 (G).


Phenology: Flowering (frequent) late spring–fall.
Habitat: Mesotrophic to eutrophic, quiet waters in temperate regions with relatively mild winters
Elevation: 0–600 m

Distribution

V22 327-distribution-map.jpg

Que., Ark., Conn., Del., D.C., Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Minn., Mo., Nebr., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., Tenn., Tex., Vt., Va., W.Va., Wis.

Discussion

I know of no specimens of Lemna perpusilla from Connecticut or New Hampshire.

Selected References

None.

Lower Taxa

None.
... more about "Lemna perpusilla"
Elias Landolt +
Torrey +
small green +
Lenticule très petite +
Que. +, Ark. +, Conn. +, Del. +, D.C. +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, Maine +, Md. +, Mass. +, Minn. +, Mo. +, Nebr. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, Tenn. +, Tex. +, Vt. +, Va. +, W.Va. +  and Wis. +
0–600 m +
coherent +
submersed +  and floating +
1-or-2-few +
ovate-obovate +
0.1 cm1 mm <br />0.001 m <br /> (0.4 cm4 mm <br />0.004 m <br />) +
not differentiated +
0.07 cm0.7 mm <br />7.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Mesotrophic to eutrophic, quiet waters in temperate regions with relatively mild winters +
denticulate +  and entire +
tapering +  and bottle--shaped +
Flowering (frequent) late spring–fall. +
Fl. New York +
indistinct +
0 cm0 mm <br />0 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
membranous +
Weedy +, Illustrated +  and Endemic +
distinct +
funnel--shaped +
Lemna perpusilla +
species +
pointed +  and sharp +
distal;middle +
1 (?) +  and 3 (?) +
greatest +
submersed +  and floating +
22 +, 21 +  and 10 +