Cerastium tomentosum |
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céraiste tomenteux, dusty miller, snow-in-summer, snow-in-summer chickweed, tomentose chickweed |
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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 |
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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 |
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]
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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 | |
Name authority | Linnaeus: Sp. Pl. 1: 440. (1753) |
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