Aleutian Chickweed

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.

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.

Alaska.

Flowering summer.

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

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

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.

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.