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

Habit Plants perennial, mat-forming, rhizomatous.
Stems

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, 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

lax, 3–13-flowered cymes;

bracts lanceolate, margins scarious, pubescent.

Pedicels

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

Flowers

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, slightly curved, 10–15 mm, 1.5–2 times as long as sepals;

teeth 10, erect, margins convolute.

Seeds

brown, ca. 1.5 mm, round tubercles on margins, faces shallowly rugose;

testa not inflated.

2n

= 72.

Cerastium tomentosum

Phenology Flowering spring.
Habitat A commonly grown rock-garden and wall plant, often escaping onto roadsides, riverbanks, old fields
Elevation 0-400 m (0-1300 ft)
Distribution
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 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. 91.
Parent taxa 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. texanum, C. velutinum, C. viride
Name authority Linnaeus: Sp. Pl. 1: 440. (1753)
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