Cerastium glomeratum |
Cerastium dichotomum |
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céraiste aggloméré, large mouse ears, sticky chickweed, sticky mouse-ear chickweed |
dry chickweed, fork chickweed, fork mouse-ear 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, simple or several from branched caudex, 15–30 cm, densely viscid-glandular; small axillary tufts of leaves usually 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; blade broadly linear to linear lanceolate to oblong, 12–30(–50) × 3–10(–15) mm, apex usually acute, densely viscid-glandular. |
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. |
dense, 3–30-flowered cymes; bracts foliaceous, glandular-pubescent. |
Pedicels | erect to spreading, often arcuate distally, 0.1–5 mm, shorter than capsule, glandular-pubescent. |
erect, 2–10 mm, shorter than sepals, with dense, spreading, glandular pubescence. |
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 lanceolate, 6–11 mm, margins narrow, apex acute, pubescence dense, stout, shorter than sepal tips, viscid-glandular; petals oblanceolate, 8–10 mm, ca. equaling sepals, apex shortly 2-fid; stamens 5; styles 5. |
Capsules | narrowly cylindric, curved, 7–10 mm; teeth 10, erect, margins convolute. |
narrowly conic, straight, 10–15 mm, ca. 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. |
chestnut brown, ca. 1.3 mm, tuberculate; testa not inflated. |
2n | = 72. |
= 38. |
Cerastium glomeratum |
Cerastium dichotomum |
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Phenology | Flowering throughout growing season. | Flowering spring–early summer. |
Habitat | Arable land, waste places, roadsides | Arable land, roadsides |
Elevation | 0-1800 m (0-5900 ft) | 300-900 m (1000-3000 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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CA; OR; WA; s Europe [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.) |
Cerastium dichotomum is very similar to C. inflatum Link from the Middle East [C. dichotomum subsp. inflatum (Link) Cullen] and is sometimes equated with it, but that species differs from C. dichotomum in having an inflated fruiting calyx. Reports of C. siculum Gussone in North America are referable to C. dichotomum. Cerastium dichotomum is a rare weed of arable land and roadsides. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 5, p. 87. | FNA vol. 5, p. 84. |
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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