Cerastium glomeratum |
Cerastium semidecandrum |
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céraiste aggloméré, large mouse ears, sticky chickweed, sticky mouse-ear chickweed |
five-stamen chickweed, five-stamen mouse-ear chickweed, five-stamen mouse-ear chikweed, little chickweed |
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Habit | Plants annual, with slender taproots. | Plants annual, with slender taproot. |
Stems | erect or ascending, branched, 5–45 cm, hairy, glandular at least distally, rarely eglandular; small axillary tufts of leaves absent. |
erect or ascending, branching at base, 1–20 cm, viscid, covered with short, dense, glandular and eglandular hairs; short axillary tufts of leaves absent. |
Leaves | not marcescent, ± sessile; blade 5–20(–30) × 2–8(–15) mm, apex apiculate, covered with spreading, white, long hairs; basal with blade oblanceolate or obovate, narrowed proximally, sometimes spatulate; cauline with blade broadly ovate or elliptic-ovate. |
not marcescent, sessile but proximal leaves often spatulate; blade 5–18 × 2–5 mm, covered with short, white hairs; basal leaves with blade narrowly oblanceolate and ± spatulate, apex obtuse; cauline with blades ovate to elliptic-oblong, apex obtuse to acute. |
Inflorescences | 3–50-flowered, aggregated into dense, cymose clusters or in more-open dichasia; bracts: proximal herbaceous, distal lanceolate, apex acute, with long, mainly eglandular hairs. |
open, 3–30-flowered cymes; bracts lanceolate, with broad, scarious margins, glandular-pubescent. |
Pedicels | erect to spreading, often arcuate distally, 0.1–5 mm, shorter than capsule, glandular-pubescent. |
curved at apex, often sharply angled at base, 3–8(–12) mm, 1–3 times as long as capsule, densely glandular-pubescent and viscid. |
Flowers | sepals green, rarely dark-red tipped, lanceolate, 4–5 mm, margins narrow, apex very acute, usually with glandular hairs as well as long white hairs usually extending beyond apex; petals oblanceolate, 3–5 mm, rarely absent, usually shorter than sepals, apex deeply 2-fid; stamens 10; styles 5. |
sepals narrowly lanceolate, 3–5 mm, margins broad, apex acute, glandular-pubescent; petals with unbranched veins, oblanceolate, 2–3 mm, shorter than sepals, apex notched; stamens 5; styles 5. |
Capsules | narrowly cylindric, curved, 7–10 mm; teeth 10, erect, margins convolute. |
cylindric, slightly curved, 4.5–6.5 mm, 1.5–2 times as long as sepals; teeth 10, erect, margins convolute. |
Seeds | pale brown, 0.5–0.6 mm, finely tuberculate; testa inflated or not. |
pale yellowish brown, 0.4–0.6 mm, finely tuberculate; testa not inflated. |
2n | = 72. |
= 36. |
Cerastium glomeratum |
Cerastium semidecandrum |
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Phenology | Flowering throughout growing season. | Flowering spring. |
Habitat | Arable land, waste places, roadsides | Common weed in dry, sandy, and gravelly places, roadsides and footpaths, parking lots, dunes |
Elevation | 0-1800 m (0-5900 ft) | 0-300 m (0-1000 ft) |
Distribution |
AK; AL; AR; AZ; CA; CT; DC; DE; FL; GA; ID; IL; IN; KS; KY; LA; MA; MD; MI; MO; MS; MT; NC; NJ; NM; NV; NY; OH; OK; OR; PA; RI; SC; TN; TX; VA; WA; WV; BC; NF; NS; ON; QC; YT; Europe [Introduced in North America; introduced and common in Mexico]
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AR; CT; FL; GA; ID; IL; IN; KS; LA; MA; MD; MI; MO; NC; NE; NJ; NY; OH; OR; PA; RI; SC; WA; WI; BC; NS; ON; Eurasia [Introduced in North America]
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Discussion | Cerastium glomeratum often has been reported as C. viscosum Linneaus, an ambiguous name; see discussion under the genus. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The very broad, scarious margins of the sepals and bracts distinguish this small, ephemeral species. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 5, p. 87. | FNA vol. 5, p. 90. |
Parent taxa | Caryophyllaceae > subfam. Alsinoideae > Cerastium | Caryophyllaceae > subfam. Alsinoideae > Cerastium |
Sibling taxa | ||
Synonyms | C. acutatum, C. fulvum | |
Name authority | Thuillier: Fl. Env. Paris ed. 2, 226. (1799) | Linnaeus: Sp. Pl. 1: 438. (1753) |
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