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

anomalous mouse-ear chickweed, doubtful chickweed, three-style chickweed

Habit Plants annual, with slender taproot and branched caudex. Plants annual, taprooted.
Stems

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

erect, many-branched from base, 10–40 cm, minutely viscid-glandular; small axillary tufts of leaves usually 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.

not marcescent, distal sessile, proximal spatulate;

blade linear or linear- lanceolate to linear-oblong, 10–30 × 1–4 mm, apex obtuse to subacute, glabrous or sparsely and minutely viscid-glandular.

Inflorescences

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

bracts narrowly lanceolate, pilose.

lax, 3–21(–30)-flowered cymes;

bracts narrowly lanceolate, glandular-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.

erect, slender, 2–15 mm, 0.5–3 times as long as sepals, glandular-puberulent Flowers: sepals ovate-lanceolate, 5–6 mm, margins narrow, apex acute to obtuse, minutely viscid-glandular;

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

stamens 10;

styles 3(–4).

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.

Capsules

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

teeth 10, becoming outwardly coiled.

oblong-ovoid, straight, 8–11 mm, ca. 2 times as long as sepals;

teeth 6, occasionally 8, erect to spreading, margins convolute.

Seeds

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

tubercles ± pointed;

testa not inflated.

pale brown, ovate, 0.6 mm diam., tuberculate;

testa not inflated.

2n

= 36.

= 36, 38.

Cerastium texanum

Cerastium dubium

Phenology Flowering spring. Flowering spring.
Habitat Canyons, sandy washes, oak woodlands, mountain pine forests Alien weed of cultivated land
Elevation 1200-2800 m (3900-9200 ft) 200-800 m (700-2600 ft)
Distribution
from FNA
AZ; NM; Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
AR; ID; IL; IN; KS; KY; MS; OH; OR; TN; VA; WA; s Europe; Asia [Introduced in North America]
[WildflowerSearch map]
[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.)

First collected in North America in 1966 in Washington, Cerastium dubium has now been gathered from many widely scattered sites, and appears to be spreading rapidly.

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

Source FNA vol. 5, p. 90. FNA vol. 5, p. 85.
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. aleuticum, C. alpinum, C. arcticum, C. arvense, C. axillare, C. beeringianum, C. bialynickii, C. brachypetalum, C. brachypodum, C. cerastoides, C. dichotomum, C. diffusum, 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 Stellaria dubia, C. anomalum, Dichodon viscidum
Name authority Britton: Bull. Torrey Bot. Club 15: 97. (1888) (Bastard) Guépin: Fl. Maine et Loire ed. 2, 1: 267. (1838)
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