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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Heilongjiang, Jilin, Liaoning, Nei Mongol, Xinjiang, Xizang [Korea, Japan, Mongolia, Russia (Far East, Siberia); C and W Asia to W Himalaya, Europe, W North America]
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National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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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: Juniperus communis var. charlottensis occurs from Calvert Island (north of Vancouver Island) to Queen Charlotte Island, and on several islands and coastal mainland areas north to Chichagof Island, Alaska.

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Physical Description

Morphology

Description

Shrubs procumbent, to 70 cm; branchlets densely arranged, 3-angled, thick, ca. 2 mm in diam. Leaves in whorls of 3, ascending, lanceolate or linear, usually subfalcate, 4-10 × 1-2 mm, slightly concave adaxially with a single white stomatal band broader than green marginal bands, keeled abaxially, base jointed, not decurrent. Pollen cones axillary, subglobose or ellipsoid, 3-5 mm; microsporophylls 9-12, each with 3-6 pollen sacs. Seed cones brownish black when ripe, glaucous, globose or subglobose, 4-7 mm in diam. Seeds 1-3 per cone, 3-4 mm.
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Diagnostic Description

Synonym

Juniperus communis Linnaeus var. montana Aiton (1789), not Neilreich (1859); J. communis var. nana (Willdenow) Baumgarten; J. communis var. saxatilis Pallas; J. nana Willdenow.
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Ecology

Habitat

Comments: This variety only grows on serpentine or lava (ultramafic rocks) but also can be found at high elevation on this substrate (Adams 2008).

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Comments: This variety grows on muskeg or sphagnum bogs at low-lying areas near the ocean (Adams 2008).

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Mountain areas; 600-4200 m.
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Associations

Foodplant / pathogen
erumpent apothecium of Colpoma juniperi infects and damages live twig of Juniperus nana
Remarks: season: 5-7

Foodplant / saprobe
hysteroid apothecium of Lophodermium juniperinum is saprobic on dead leaf of Juniperus nana
Remarks: season: 8-10

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Foodplant / pathogen
erumpent apothecium of Colpoma juniperi infects and damages live twig of Juniperus communis ssp. alpina
Remarks: season: 5-7

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Population Biology

Number of Occurrences

Note: For many non-migratory species, occurrences are roughly equivalent to populations.

Estimated Number of Occurrences: Unknown

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Juniperus sibirica

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 0
Specimens with Barcodes: 4
Species With Barcodes: 1
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Barcode data: Juniperus communis var. saxatilis

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


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Statistics of barcoding coverage: Juniperus communis var. saxatilis

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 5
Specimens with Barcodes: 5
Species With Barcodes: 1
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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: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: T4 - Apparently Secure

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National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: T1 - Critically Imperiled

Reasons: This variety is only found in the Siskiyou Mountains of northwestern California and southwestern Oregon. It grows on very specific areas (ultramafic rocks) and can also be found at high elevation (Mt. Hood, Oregon). Little is known of about populations numbers but this variety is limited to a very narrow area in the mountains and only on specific substrate.

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National NatureServe Conservation Status

Canada

Rounded National Status Rank: N3 - Vulnerable

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: T3 - Vulnerable

Reasons: This variety is described as distinctive in by Adams (Phytologia 2008). It is restricted to muskeg bogs (atypical of Juniperus communis) on coastal islands and the mainland coast of British Columbia and Alaska. Adams in his book Junipers of the World (2008) outlines this variety growing in very specific areas and likely threatened by habitat degradation.

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Notes

Comments

Records of Juniperus communis Linnaeus from China (e.g., in FRPS) are probably referable to J. sibirica (which some authors treat as J. communis var. saxatilis); however, typical J. communis is distributed from Europe to Siberia, E to the Amur River.
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Names and Taxonomy

Taxonomy

Comments: Dr. R.P. Adams in his 2008 treatment of the genus Juniperus (Junipers of the World: The genus Juniperus), recognizes the variety saxatilis Pall. treating var. montana Ait. as the synonym.

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Comments: Adams (2008) describes this new variety in Phytologia 90(2) as well as outlines its occurrence in his 2008 book on Junipers of the World. Adams notes that this variety is grows specifically on serpentine or lava (ultramafic rocks). Juniperus communis var. jackii is distinct in its nrDNA from other varieties.

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Comments: Adams (2008) describes this new variety in Phytologia 90(2) as well as outlines its occurrence in his 2008 book on Junipers of the World. Adams notes that this variety is atypical of Juniperus communis in its growth specifically in muskeg bogs. Juniperus communis var. charlottensis is distinct in its nrDNA from other varieties.

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