Overview

Distribution

National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Global Range: This species is known from high mountain slopes of the Aleutian, Pribilof, and Semidi Islands. It is also reported (but not confirmed) from Kodiak Island.

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Alaska.
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Physical Description

Morphology

Description

Plants perennial, tufted, rhizoma-tous, eglandular. Stems branched, 3-7 cm, subglabrous proximally, softly pubescent distally, proximal internodes congested; small axillary tufts of leaves absent. Leaves proximal leaves marcescent, pseudopetiolate, spatulate, distal sessile; blade elliptic to lanceolate or oblanceolate, 4-12 × 2-5 mm, apex ± obtuse, hirsute with long, straight, eglandular hairs or subglabrous except for midrib and margins. Inflorescences 1-3-flowered, dense cymes; bracts foliaceous, margins not scarious, pubescent. Pedicels becoming curved at apex, slender, 2-12 mm, to 3 times as long as sepals, pubescence spreading, eglandular, fuscous hairs equaling or longer than pedicel diam. Flowers: sepals lanceolate to elliptic, concave, 4-5 mm, margins narrow, apex acute to obtuse, pubescent; petals 1-1.5 times as long as sepals, apex 2-fid; stamens 10; styles 5. Capsules cylindric, slightly curved, 8-11 mm, 1-2 times as long as sepals, teeth 10, ± erect, margins convolute. Seeds brown, 0.8-1 mm, shallowly and obtusely tuberculate; testa not inflated, tightly enclosing seed.
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Diagnostic Description

Synonym

Cerastium beeringianum Chamisso & Schlechtendal var. aleuticum (Hultén) S. L. Welsh
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Ecology

Habitat

Comments: High alpine fell-field and screes.

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Stony ground, screes, etc., mountain slopes; 200-700m.
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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: 6 - 80

Comments: Known from at least sixteen sites in remote alpine areas. Additional sites should be expected as these areas are explored.

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Life History and Behavior

Cyclicity

Flowering/Fruiting

Flowering summer.
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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: N3 - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: G3 - Vulnerable

Reasons: Known from sixteen sites in remote alpine areas. This small, easily overlooked species is likely to be found at additional sites as these areas are further explored.

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Threats

Comments: The high alpine habitats in the Aleutian and Pribilof Islands face no threats at present.

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Wikipedia

Cerastium aleuticum

Cerastium aleuticum, common name Aleutian mouse-ear chickweed, is a plant species endemic to the US State of Alaska. It is found only on islands, not on the Alaskan mainland: Aleutian, St. Lawrence, St. Paul, Popof, and Kodiak Islands. It is found on rocky slopes and mountainsides up to an elevation of 700 m.[2]

Cerastium aleuticum is a perennial herb spreading by means of underground rhizomes. Stems are branched, up to 7 cm long, covered with soft hairs. Flowers are single or in groups of 2 or 3, white. Capsules are cylindrical, up to 11 mm long. [2][3][4][5][6]

References[edit]

  1. ^ The Plant List
  2. ^ a b Flora of North America v 5
  3. ^ Hultén, Oskar Eric Gunnar. 1936. Svensk Botanisk Tidskrift 30(3): 520–521, f. 3a–b.
  4. ^ Hultén, E. 1968. Flora of Alaska i–xxi, 1–1008. Stanford University Press, Stanford.
  5. ^ Welsh, S. L. 1974. Anderson's Flora of Alaska and Adjacent Parts of Canada i–xvi, 1–724. Brigham Young University Press, Provo.
  6. ^ Welsh, Stanley Larson. 1968. Great Basin Naturalist 28(3): 148.
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Notes

Comments

Cerastium aleuticum is an eglandular relative of C. beeringianum. It is similar to C. bialynickii except in being eglandular and having less dense pubescence and narrower sepals. It is confined to the western arctic, mainly on the Aleutian, St. Lawrence, St. Paul, Popof, and Kodiak islands, but is not found on mainland Alaska.
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Names and Taxonomy

Taxonomy

Comments: A distinct taxon, endemic to the Aleutian, Pribilof and Kodiak Islands. Recognized as a distinct species by most authors (including Kartesz, 1994 checklist), but treated as a variety of C. BEERINGIANUM by Welsh (1974).

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