Cerastium arvense |
Cerastium terrae-novae |
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céraiste des champs, field chickweed, field mouse-ear chickweed, field or prairie mouse-ear chickweed, meadow chickweed, starry cerastium |
mouse-ear chickweed, Newfoundland mouse-ear chickweed |
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Habit | Plants perennial, clumped and taprooted, or mat-forming and long-creeping rhizomatous. | Plants perennial, tufted, rhizomatous. | ||||
Stems | flowering shoots often decumbent proximally, 5–20(–30) cm, glandular-pubescent distally, pilose-subglabrous, deflexed or spreading proximally; non-flowering shoots present; small tufts of leaves present in axils of proximal leaves. |
loosely ascending to suberect, branched, very leafy, 10–15 cm, pubescence short, dense, glandular; small axillary tufts of leaves usually absent. |
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Leaves | not marcescent, sessile, ± spatulate proximally; blade linear-lanceolate to lanceolate or narrowly oblong, 4–30 × 0.5–6 mm, apex acute, rarely obtuse, subglabrous to softly pubescent, sometimes glandular. |
tending to be marcescent, sessile but spatulate proximally; blade elliptic-oblong, 5–14 × 1.5–3.5 mm, apex obtuse, densely glandular-hirsute. |
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Inflorescences | lax, 1–20-flowered cymes, pubescence short, glandular; bracts lanceolate, margins narrow, scarious, glandular-pubescent. |
lax, 1–3-flowered cymes; bracts ovate-lanceolate, margins very narrow, scarious, glandular-pubescent. |
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Pedicels | curved just below calyx, 5–30 mm, 1–6 times as long as sepals, glandular-pubescent. |
mostly erect, slender, 10–25 mm, 1–4 times as long as sepals, densely glandular-pubescent. |
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Flowers | sepals narrowly lanceolate to lance-elliptic, 3.5–7 mm, margins narrow, softly pubescent; petals obovate, 7.5–12.5 mm, ca. 2 times as long as sepals, apex 2-fid; stamens 10; anthers 0.8–1.1 mm; styles 5. |
sepals ovate-oblong, 5.5–6.5 mm, elongating to 6–7 mm in fruit, margins broad, apex obtuse, glandular-pubescent; petals narrowly oblanceolate, 7–10 mm, 1.5–2 times as long as sepals, apex 2-fid; stamens 10; styles 5. |
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Capsules | cylindric, curved, 7.5–11.5 × 2.5–4 mm, (1–)1.5–2 times as long as sepals; teeth 10, erect, margins convolute. |
ovate-cylindric, ca. straight, short, broad, 9–13 mm, ca. 2 times as long as sepals; teeth 10, erect or partially spreading, margins convolute. |
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Seeds | brown, 0.6–1.2 mm diam., tuberculate; testa not inflated. |
brown, 1.3–1.7 mm diam., with prominent papillae around margins and rows of small, transverse ridges on sides; testa inflated, loose (rubs off when rolled between finger and thumb). |
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2n | = 36, 72, (108, Europe). |
= 108. |
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Cerastium arvense |
Cerastium terrae-novae |
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Phenology | Flowering summer. | |||||
Habitat | Serpentine gravel, sands, rocky tablelands | |||||
Elevation | 20-700 m (100-2300 ft) | |||||
Distribution |
AK; AZ; CA; CO; CT; IA; ID; IN; MA; MD; ME; MI; MN; MO; MT; ND; NE; NH; NJ; NM; NV; NY; OH; OR; PA; SD; UT; VA; VT; WA; WI; WV; WY; AB; BC; MB; NB; NF; NS; NT; NU; ON; PE; QC; SK; YT; Worldwide
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NF |
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Discussion | Subspecies 2+ (2 in the flora). The infraspecific taxonomy of Cerastium arvense is subject to many different interpretations. While many subspecies have been recognized, the “actual” number is uncertain because of worldwide distribution, wide range of variation, and conflicting taxonomies. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Cerastium terrae-novae is the only member of the European C. nigrescens group of species to occur in North America. The group is distinguished by large seeds with loose testae. Cerastium terrae-novae is distinguished by its narrowly elliptic leaves, usually purple-suffused stems and sepals, broad, straight capsule, short pubescence, and poorly developed inflorescence that often is reduced to a single flower. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 5, p. 79. | FNA vol. 5, p. 90. | ||||
Parent taxa | Caryophyllaceae > subfam. Alsinoideae > Cerastium | Caryophyllaceae > subfam. Alsinoideae > Cerastium | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | C. beeringianum subsp. terrae-novae | |||||
Name authority | Linnaeus: Sp. Pl. 1: 438. (1753) | Fernald & Wiegand: Rhodora 22: 176. (1921) | ||||
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