Overview

Distribution

Localities documented in Tropicos sources

Anacharis nuttallii Planch.:
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
  • Gleason, H. A. & A. J. Cronquist. 1968. The Pteridophytoa, Gymnospermae and Monocotyledoneae. 1: 1–482. In H. A. Gleason Ill. Fl. N. U.S. (ed. 3). New York Botanical Garden, New York.   http://www.tropicos.org/Reference/1495 External link.
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Localities documented in Tropicos sources

Elodea columbiana H. St. John:
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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Localities documented in Tropicos sources

Elodea nuttallii (Planch.) H. St. John:
Canada (North America)
United States (North America)

Note: This information is based on publications available through Tropicos and may not represent the entire distribution. Tropicos does not categorize distributions as native or non-native.
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N.B., Ont., Que.; Ark., Calif., Colo., Conn., Del., Idaho, Ill., Ind., Iowa, Kans., Ky., Maine, Md., Mass., Mich., Minn., Mont., Mo., Nebr., Nev., N.H., N.J., N.Y., N.C., N.Dak., Ohio, Okla., Oreg., Pa., R.I., S.Dak., Tenn., Vt., Va., Wash., W.Va., Wis., Wyo.; Europe; Asia.
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National Distribution

Canada

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Physical Description

Morphology

Description

Leaves mostly in 3s, often recurved, linear to lanceolate, 4--15.5 ´ 0.9--1.7(--2.4) mm, margins folded. Inflorescences: staminate spathes subglobose to ovoid, 2.2--4 mm; peduncles abscissing in bud; pistillate spathes linear, 8.5--15 mm. Flowers unisexual; staminate flowers: stamens 9, pedicels briefly remaining attached following anthesis; inner 3 filaments connate proximally, forming column; anthers 1--1.4 mm; pollen in tetrads; pistillate flowers: styles mostly 1.2--2 mm. Seeds fusiform, 4--4.6 mm, base with long hairs. 2n = 48 (Britain).
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Diagnostic Description

Synonym

Anacharis nuttallii Planchon, Ann. Mag. Nat. Hist., ser. 2, 1: 86. 1848
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Ecology

Habitat

Waters, mostly calcareous, of lakes and rivers; 50--1600m.
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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering summer.
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Molecular Biology and Genetics

Molecular Biology

Barcode data: Elodea nuttallii

The following is a representative barcode sequence, the centroid of all available sequences for this species.


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Statistics of barcoding coverage: Elodea nuttallii

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 3
Specimens with Barcodes: 4
Species With Barcodes: 1
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: NNR - Unranked

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Management

These species are introduced in Switzerland.
  • Aeschimann, D. & C. Heitz. 2005. Synonymie-Index der Schweizer Flora und der angrenzenden Gebiete (SISF). 2te Auflage. Documenta Floristicae Helvetiae N° 2. Genève.   http://www.crsf.ch/ External link.
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Wikipedia

Elodea nuttallii

Elodea nuttallii is a species of waterweed known by the common name western waterweed or Nuttall's waterweed. This is a perennial aquatic plant which is native to North America where it grows submersed in lakes, rivers, and other shallow water bodies. It is also found in Eurasia, where it is commonly weedy; it is not known as a weed species in its native range. It is sometimes used as an aquarium plant.

Description[edit]

It is similar to its relative, Elodea canadensis. However the leaves taper to an acute point.

It has a thin branching stem with whorls of flat leaves at intervals. Some leaves are recurved and twisted, with minute teeth.

It bears tiny flowers, the staminate ones abscissing from their stalks and floating away from the plant. It flowers from May until October.[1]

Distribution[edit]

Recorded from the River Lagan near Shaw's Bridge and Lough Neagh in Co. Tyrone.[2]

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Notes

Comments

I know of no instance in North America where Elodea nuttalli or E. canadensis is weedy. Both are weedy in Europe, and E. canadensis is weedy also in Australia and New Zealand.
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