Cerastium aleuticum

Hultén

Svensk Bot. Tidskr. 30: 520, figs. 3a,b. 1936.

Common names: Aleutian mouse-ear chickweed
Endemic
Synonyms: Cerastium beeringianum var. aleuticum (Hultén) S. L. Welsh
Treatment appears in FNA Volume 5. Treatment on page 77. Mentioned on page 76.

Plants perennial, tufted, rhizomatous, 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.


Phenology: Flowering summer.
Habitat: Stony ground, screes, etc., mountain slopes
Elevation: 200-700 m

Discussion

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.

Selected References

None.

Lower Taxa

None.

"-2timesaslongassepals" is not declared as a valid unit of measurement for this property."-1.5timesaslongassepals" is not declared as a valid unit of measurement for this property.

... more about "Cerastium aleuticum"
perigynous +  and hypogynous +
pubescent +  and hirsute +
John K. Morton +
Hultén +
elliptic to broadly ovate +  and linear +
0.4 cm4 mm <br />0.004 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
elliptic +  and lanceolate or oblanceolate +
2mm;5mm +
often +  and herbaceous +
reduced +
herbaceous +  and scarious +
8 +  and 6 +
cylindric +
0.8 cm8 mm <br />0.008 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
Aleutian mouse-ear chickweed +
dish--shaped +
expanded +
200-700 m +
straight +  and curved +
central +  and peripheral +
pistillate +  and subsessile +
inconspicuous +
unisexual +  and bisexual +
stalked +  and simple +
Stony ground, screes, etc., mountain slopes +
straight +
longer +  and long +
disc--shaped +  and dish +
sessile +  and petiolate +
connate +
translucent +  and purplish +
pubescent;subglabrous +
subglabrous +
swollen +
3 +  and 5 +
crassinucellate +  and bitegmic +
campylotropous +
0-3 times as long as sepals +
reflexed;erect +
0.2 cm2 mm <br />0.002 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
perigynous +  and hypogynous +
fugacious +
Flowering summer. +
Svensk Bot. Tidskr. +
tuberculate +
compressed +  and angular-obovate +
persistent +
distinct +
concave;lanceolate;elliptic +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
ascending;erect or decumbent +
3 cm30 mm <br />0.03 m <br /> (7 cm70 mm <br />0.07 m <br />) +
subterminal +
[30 +  and 5 +
roughened +  and papillate +
distinct +
clavate +  and filiform +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
Cerastium beeringianum var. aleuticum +
rooting +  and rhizomatous +
Cerastium aleuticum +
Cerastium +
species +
not inflated +
divided +
10 +  and 8 +
eglandular +  and rhizomatous +
pubescence of simple hairs or stalked glands +  and glabrous +
19 +, 18 +, 17 +, 15] +, 13 +  and [9 +