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Chihuahuan mouse-ear chickweed, Texas chickweed, Texas mouse-ear chickweed

Aleutian chickweed, Aleutian mouse-ear chickweed

Habit Plants annual, with slender taproot and branched caudex. Plants perennial, tufted, rhizoma-tous, eglandular.
Stems

erect, sparingly branched proximally, slender, 15–35 cm, sparsely glandular-pilose; small axillary tufts of leaves absent.

branched, 3–7 cm, subglabrous proximally, softly pubescent distally, proximal internodes congested; small axillary tufts of leaves absent.

Leaves

not marcescent;

proximal blades broadly spatulate-petiolate, 8–55 × 3–16 mm, apex acute or obtuse, sometimes short-acuminate, softly pilose;

cauline few, sessile, blade linear-lanceolate to narrowly oblanceolate, 7–30 mm, apex acute, pilose.

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

very open and loose, 2–9(–25)-flowered cymes;

bracts narrowly lanceolate, pilose.

1–3-flowered, dense cymes;

bracts foliaceous, margins not scarious, pubescent.

Pedicels

straight, becoming sharply deflexed at base, slender, 5–20 mm, elongating in fruit, 1.5–4 times as long as sepals, glandular-pilose.

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 green, turning pale orange-brown in fruit, lanceolate to ovate, 3–6 mm, margins narrow, apex acute, with short, glandular pubescence;

petals oblanceolate, 5–8 mm, 1.5–2 times as long as sepals, apex 2-fid;

stamens 5;

styles 5.

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, straight, 5–12 mm, 1.5–2 times as long as sepals;

teeth 10, becoming outwardly coiled.

cylindric, slightly curved, 8–11 mm, 1–2 times as long as sepals, teeth 10, ± erect, margins convolute.

Seeds

red-brown, 0.4–0.7 mm diam., tuberculate;

tubercles ± pointed;

testa not inflated.

brown, 0.8–1 mm, shallowly and obtusely tuberculate;

testa not inflated, tightly enclosing seed.

2n

= 36.

Cerastium texanum

Cerastium aleuticum

Phenology Flowering spring. Flowering summer.
Habitat Canyons, sandy washes, oak woodlands, mountain pine forests Stony ground, screes, etc., mountain slopes
Elevation 1200-2800 m (3900-9200 ft) 200-700 m (700-2300 ft)
Distribution
from FNA
AZ; NM; Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
AK
[BONAP county map]
Discussion

Cerastium texanum is exceptionally variable in flower and capsule size. The extent to which this variation is due to environmental conditions or is genic in origin is not known. The broad, spatulate basal leaves and the straight, cylindric capsule with its outwardly coiled (revolute) teeth distinguish this species.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 5, p. 90. FNA vol. 5, p. 77.
Parent taxa Caryophyllaceae > subfam. Alsinoideae > Cerastium Caryophyllaceae > subfam. Alsinoideae > Cerastium
Sibling taxa
C. aleuticum, C. alpinum, C. arcticum, C. arvense, C. axillare, C. beeringianum, C. bialynickii, C. brachypetalum, C. brachypodum, C. cerastoides, C. dichotomum, C. diffusum, C. dubium, C. fastigiatum, C. fischerianum, C. fontanum, C. glomeratum, C. maximum, C. nutans, C. pumilum, C. regelii, C. semidecandrum, C. terrae-novae, C. tomentosum, C. velutinum, C. viride
C. alpinum, C. arcticum, C. arvense, C. axillare, C. beeringianum, C. bialynickii, C. brachypetalum, C. brachypodum, C. cerastoides, C. dichotomum, C. diffusum, C. dubium, C. fastigiatum, C. fischerianum, C. fontanum, C. glomeratum, C. maximum, C. nutans, C. pumilum, C. regelii, C. semidecandrum, C. terrae-novae, C. texanum, C. tomentosum, C. velutinum, C. viride
Synonyms C. longepedunculatum var. sordidum, C. sordidum, Stellaria montana C. beeringianum var. aleuticum
Name authority Britton: Bull. Torrey Bot. Club 15: 97. (1888) Hultén: Svensk Bot. Tidskr. 30: 520, figs. 3a,b. (1936)
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