Cerastium glomeratum |
Cerastium velutinum |
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céraiste aggloméré, large mouse ears, sticky chickweed, sticky mouse-ear chickweed |
large field mouse-ear chickweed |
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Habit | Plants annual, with slender taproots. | Plants perennial, usually clumped, taproot present, sometimes with short rhizomes. | ||||
Stems | erect or ascending, branched, 5–45 cm, hairy, glandular at least distally, rarely eglandular; small axillary tufts of leaves absent. |
flowering shoots ascending, often decumbent at base, branched, (15–)25–35(–40) cm, softly pubescent to subglabrous, hairs spreading, straight, concentrated in longitudinal lines toward base, glandular and eglandular; nonflowering leafy shoots often present, straggling, 5–15 cm; small axillary tufts of leaves present. |
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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. |
sessile; cauline with largest at mid stem, smaller distally and proximally, blade narrowly oblong, linear-lanceolate to lanceolate or ovate, 20–45 × 3–11 mm, apex usually obtuse, softly ciliate-pubescent on both surfaces, more so on margins and abaxial midrib, rarely subglabrous, sometimes densely villose; proximal leaf blades often oblanceolate, apex ± obtuse. |
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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. |
lax, 5–20-flowered cymes, pubescent, glandular, not viscid; bracts lanceolate, proximal foliaceous, distal smaller, with scarious margins, glandular-pubescent. |
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Pedicels | erect to spreading, often arcuate distally, 0.1–5 mm, shorter than capsule, glandular-pubescent. |
curved immediately below capsule, slender, 10–24 mm, ca. 2 times as long as sepals, pubescence spreading, glandular. |
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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-elliptic, 5–8 mm, margins narrow, apex acute, densely and softly glandular-pubescent; petals obovate, 10–15 mm, 2 times as long as sepals, apex deeply 2-fid; stamens 10; anthers 0.9–1.1 mm; styles 5. |
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Capsules | narrowly cylindric, curved, 7–10 mm; teeth 10, erect, margins convolute. |
cylindric, slightly curved, slender, 10–14 × 3–4 mm, 2–2.3 times as long as sepals; teeth 10, erect, margins convolute. |
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Seeds | pale brown, 0.5–0.6 mm, finely tuberculate; testa inflated or not. |
brown, 0.8–1.2 mm diam., tuberculate; testa not inflated, tightly enclosing seed. |
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2n | = 72. |
= 72. |
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Cerastium glomeratum |
Cerastium velutinum |
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Phenology | Flowering throughout growing season. | |||||
Habitat | Arable land, waste places, roadsides | |||||
Elevation | 0-1800 m (0-5900 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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DC; DE; IA; IL; IN; KY; MA; MD; MI; MN; MO; NJ; NY; OH; PA; TN; VA; WV; ON
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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.) |
Varieties 2 (2 in the flora). Until recently Cerastium velutinum has been included in C. arvense as a variety or subspecies. However, morphological characters and chromosome number (diploid in the native forms of C. arvense, tetraploid in C. velutinum) distinguish the two taxa. They are not interfertile. Crosses between them can be produced with difficulty but they are completely sterile. None are known to occur naturally. An apparent hybrid between Cerastium velutinum and C. tometosum has been collected on the south shore of Lake Erie. It was completely sterile. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Key |
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Source | FNA vol. 5, p. 87. | FNA vol. 5, p. 91. | ||||
Parent taxa | Caryophyllaceae > subfam. Alsinoideae > Cerastium | Caryophyllaceae > subfam. Alsinoideae > Cerastium | ||||
Sibling taxa | ||||||
Subordinate taxa | ||||||
Synonyms | C. acutatum, C. fulvum | |||||
Name authority | Thuillier: Fl. Env. Paris ed. 2, 226. (1799) | Rafinesque: Med. Repos., hexade 2, 5: 359. (1808) | ||||
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