Elatine americana

(Pursh) Arnott

Edinburgh J. Nat. Geogr. Sci. 1: 431. 1830.

Common names: American waterwort élatine américaine
Endemic
Basionym: Peplis americana Pursh Fl. Amer. Sept. 1: 238. 1813
Synonyms: Elatine triandra subsp. americana (Pursh) Á. Löve & D. Löve E. triandra var. americana (Pursh) Fassett
Treatment appears in FNA Volume 12. Treatment on page 352. Mentioned on page 350, 351.

Herbs, submersed, 1.5–5 cm. Stems ascending or prostrate, branched. Leaves green; stipules lanceolate, 0.5–0.6 mm, margins dentate, apex acute; petiole 0.5–3 mm; blade obovate to broadly spatulate, 3–8 × 0.5–3.5 mm, base attenuate or cuneate, apex rounded to shallowly emarginate. Pedicels to 0.1 mm, erect. Flowers cleistogamous when submersed; sepals (2–) 3, equal or 1 reduced, oblong-ovate or widely lanceolate, 0.5 × 0.3–0.5 mm; petals 3, greenish white or pinkish white to reddish, elliptic or ovate, 0.6–1.2 × 0.5 mm; stamens 3; styles 3. Capsules oblong-ovoid, 3-locular, 1.5 mm diam. Seeds 9–12 per locule, slenderly cylindric, ± straight, 0.4–0.6 × (0.1–) 0.2 mm; pits angular-hexagonal, length 2–3 times width, in 6 (–8) rows, (13–) 16–25 (–30) per row. 2n = 36.


Phenology: Flowering summer–early fall.
Habitat: Muddy shorelines including estuaries, in water to 50 cm deep.
Elevation: 0–300(–900) m.

Distribution

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Man., N.B., N.W.T., Ont., Que., Calif., Conn., Del., Ill., Maine, Mass., Mich., Minn., Mo., Mont., N.H., N.J., N.Y., N.C., Okla., Pa., R.I., S.Dak., Va.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Elatine americana"
rounded +  and shallowly emarginate +
Hamid Razifard +, Gordon C. Tucker +  and Donald H. Les +
- Pursh Arnott +
cuneate +  and attenuate +
Peplis americana +
0.3 cm3 mm <br />0.003 m <br /> - 0.8 cm8 mm <br />0.008 m <br /> +
obovate;broadly spatulate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> - 0.35 cm3.5 mm <br />0.0035 m <br /> +
1.5 cm15 mm <br />0.015 m <br /> - ? +
oblong-ovoid +
membranous +
American waterwort +  and élatine américaine +
2[-3]-flowered +
Man. +, N.B. +, N.W.T. +, Ont. +, Que. +, Calif. +, Conn. +, Del. +, Ill. +, Maine +, Mass. +, Mich. +, Minn. +, Mo. +, Mont. +, N.H. +, N.J. +, N.Y. +, N.C. +, Okla. +, Pa. +, R.I. +, S.Dak. +  and Va. +
0–300 - –900 m. +
2[-3]-flowered +
cleistogamous +
Muddy shorelines including estuaries, in water to 50 cm deep. +
0 cm0 mm <br />0 m <br /> - 0.01 cm0.1 mm <br />1.0e-4 m <br /> +
pinkish white;reddish +
distinct +
0.6mm;1.2mm +
ovate +  and elliptic +
0.5 cm5 mm <br />0.005 m <br /> - ? +
0.05 cm0.5 mm <br />5.0e-4 m <br /> - 0.3 cm3 mm <br />0.003 m <br /> +
Flowering summer–early fall. +
2-4-carpellate +
angular-hexagonal +
Edinburgh J. Nat. Geogr. Sci. +
16 +  and 25 +
0.01 cm0.1 mm <br />1.0e-4 m <br /> - 0.02 cm0.2 mm <br />2.0e-4 m <br /> +
brown;yellowish-brown +
straight +
0.04 cm0.4 mm <br />4.0e-4 m <br /> - 0.06 cm0.6 mm <br />6.0e-4 m <br /> +
cylindric +
0.2 cm2 mm <br />0.002 m <br /> - ? +
0.5 cm5 mm <br />0.005 m <br /> - ? +
lanceolate +  and oblong-ovate +
reduced +
0.03 cm0.3 mm <br />3.0e-4 m <br /> - 0.05 cm0.5 mm <br />5.0e-4 m <br /> +
free +  and distinct +
prostrate +  and decumbent +
prostrate +  and ascending +
lanceolate +
0.05 cm0.5 mm <br />5.0e-4 m <br /> - 0.06 cm0.6 mm <br />6.0e-4 m <br /> +
membranous +
distinct +
Elatine triandra subsp. americana +  and E. triandra var. americana +
Elatine americana +
species +