Overview

Distribution

National Distribution

Canada

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: St. John River, Maine; Quebec, w. Newfoundland, Labrador?, New Brunswick?, Manitoba?, Nova Scotia?

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Ecology

Habitat

Comments: Calcareous rock ledges, gravel, and outcrops near rivers and bays.

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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: N4 - Apparently Secure

United States

Rounded National Status Rank: N1 - Critically Imperiled

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NatureServe Conservation Status

Rounded Global Status Rank: T4 - Apparently Secure

Reasons: Variety reported to be relatively common in Newfoundland and Quebec. Also known from from 7 occurrences in Maine, all on the St. John River.

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Global Short Term Trend: Relatively stable (=10% change)

Comments: Appears to be stable in Maine; reported to be common in Canada, most likely stable.

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Threats

Comments: Populations in Maine are not immediately threatened but hydropower development on the St. John River would inundate habitat. Threats to Canadian populations, if any, are unknown.

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