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

céraiste tomenteux, dusty miller, snow-in-summer, snow-in-summer chickweed, tomentose chickweed

Habit Plants annual, with slender taproot and branched caudex. Plants perennial, mat-forming, rhizomatous.
Stems

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

flowering stems ascending, branched, 15–40 cm; nonflowering stems prostrate proximally, rooting readily, pubescence dense, white-tomentose, eglandular; small axillary tufts of leaves often present.

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, sessile;

blade linear to linear-lanceolate or linear-oblong, 10–60 × 2–8 mm, apex ± obtuse, pubescence dense, whitish-tomentose, eglandular on both surfaces.

Inflorescences

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

bracts narrowly lanceolate, pilose.

lax, 3–13-flowered cymes;

bracts lanceolate, margins 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.

ascending, straight, 10–40 mm, 2–7 times as long as sepals, white-tomentose.

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.

12–20 mm diam.;

sepals narrowly lanceolate-elliptic, 5–7 mm, margins narrow, often scarious, apex acute, white-tomentose;

petals obtriangular, 10–18 mm, 2–2.5 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, 10–15 mm, 1.5–2 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, ca. 1.5 mm, round tubercles on margins, faces shallowly rugose;

testa not inflated.

2n

= 36.

= 72.

Cerastium texanum

Cerastium tomentosum

Phenology Flowering spring. Flowering spring.
Habitat Canyons, sandy washes, oak woodlands, mountain pine forests A commonly grown rock-garden and wall plant, often escaping onto roadsides, riverbanks, old fields
Elevation 1200-2800 m (3900-9200 ft) 0-400 m (0-1300 ft)
Distribution
from FNA
AZ; NM; Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
ME; MI; MT; NC; NE; NY; OH; OR; PA; WA; WI; WY; BC; MB; NB; NF; NS; ON; PE; QC; se Europe [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.)

Cerastium tomentosum hybridizes readily with the introduced C. arvense subsp. arvense (J. K. Morton 1973).

North American reports of Cerastium biebersteinii de Candolle all appear to be referable to C. tomentosum. The two species are very similar, but C. biebersteinii has flat capsule teeth and is diploid (2n = 36); see M. K. Khalaf and C. A. Stace (2001).

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

Source FNA vol. 5, p. 90. FNA vol. 5, p. 91.
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. 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. velutinum, C. viride
Synonyms C. longepedunculatum var. sordidum, C. sordidum, Stellaria montana
Name authority Britton: Bull. Torrey Bot. Club 15: 97. (1888) Linnaeus: Sp. Pl. 1: 440. (1753)
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