Overview

Distribution

National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Alta., B.C., Man., Sask.; Colo., Idaho, Kans., Minn., Mont., N.Mex., N.Dak., Oreg., S.Dak., Utah, Wyo.
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Physical Description

Morphology

Description

Leaves sometimes in 2s, spreading, linear to narrowly elliptic, 4.7--24.8 ´ (0.8--)1.8--4.3 mm, flat. Inflorescences: staminate spathes cylindric, 10.2--42 mm; peduncles abscissing following anthesis; pistillate spathes linear, 9--67 mm. Flowers unisexual; staminate flowers: stamens 7--9; pedicels remaining briefly following anthesis; inner 3 filaments connate proximally, forming column; anthers 3--4.5 mm; pollen in monads; pistillate flowers: styles 2.3--3 mm. Seeds ellipsoid, 2.8--3 mm, densely covered with long hairs.
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Diagnostic Description

Synonym

Elodea longivaginata H. St. John
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Ecology

Habitat

Waters of rivers and reservoirs; 100--2500m.
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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering summer--fall.
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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: N2 - Imperiled

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G4 - Apparently Secure

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Names and Taxonomy

Taxonomy

Comments: Kartesz (1994) includes Elodea nevadensis in E. bifoliata. E. nevadensis, if recognized as distinct, is a Nevada endemic known only from historical collections.

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