Cerastium dubium |
Cerastium brachypetalum |
|
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anomalous mouse-ear chickweed, doubtful chickweed, three-style chickweed |
gray chickweed, gray mouse-ear chickweed, grey mouse-ear |
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Habit | Plants annual, taprooted. | Plants annual. |
Stems | erect, many-branched from base, 10–40 cm, minutely viscid-glandular; small axillary tufts of leaves usually absent. |
erect, simple or branched at base, 5.5–30 cm, shaggy, hairs silvery, spreading-ascending; small axillary tufts of leaves absent. |
Leaves | not marcescent, distal sessile, proximal spatulate; blade linear or linear- lanceolate to linear-oblong, 10–30 × 1–4 mm, apex obtuse to subacute, glabrous or sparsely and minutely viscid-glandular. |
not marces-cent; blade 4–15(–20) × 1.5–5(–7) mm, pubescence of long, glandular and/or eglandular hairs; basal ± crowded, blade oblanceolate, spatulate, apex obtuse; cauline sessile, blade lanceolate or elliptic, apex acute. |
Inflorescences | lax, 3–21(–30)-flowered cymes; bracts narrowly lanceolate, glandular-pubescent. |
lax, dichasiate, 3–30-flowered cymes; bracts herbaceous, lanceolate, densely pubescent, with long, ascending, glandular or eglandular hairs. |
Pedicels | erect, slender, 2–15 mm, 0.5–3 times as long as sepals, glandular-puberulent Flowers: sepals ovate-lanceolate, 5–6 mm, margins narrow, apex acute to obtuse, minutely viscid-glandular; petals oblanceolate, 5–8 mm, 1.5 times as long as sepals, apex 2-fid; stamens 10; styles 3(–4). |
erect or ascending, bent distally in fruit, 6–15 mm, longer than capsule, shaggy, glandular or eglandular. |
Flowers | sepals lanceolate, 4–4.5 mm, foliaceous, with or without narrow margins, densely pubescent, hairs exceeding sepal tips; petals oblanceolate, 2–3 mm, ca. 0.5 times as long as sepals, apex 2-fid, sparsely ciliate proximally; stamens 10, with few long hairs near filament base; styles 5. |
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Capsules | oblong-ovoid, straight, 8–11 mm, ca. 2 times as long as sepals; teeth 6, occasionally 8, erect to spreading, margins convolute. |
cylindric, slightly curved near apex, 5–7 mm, ca. 1.5 times as long as sepals; teeth 10, erect, margins convolute. |
Seeds | pale brown, ovate, 0.6 mm diam., tuberculate; testa not inflated. |
pale brown, 0.5 mm diam., acutely tuberculate; testa not inflated. |
2n | = 36, 38. |
= 72 (Europe), 88, 90. |
Cerastium dubium |
Cerastium brachypetalum |
|
Phenology | Flowering spring. | Flowering spring. |
Habitat | Alien weed of cultivated land | Dry, sandy places, roadsides, arable land, disturbed, open areas |
Elevation | 200-800 m (700-2600 ft) | 0-400 m (0-1300 ft) |
Distribution |
AR; ID; IL; IN; KS; KY; MS; OH; OR; TN; VA; WA; s Europe; Asia [Introduced in North America]
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AL; AR; FL; GA; ID; IL; IN; KS; KY; MO; MS; NC; NY; OH; OK; OR; PA; SC; TN; TX; VA; WV; Eurasia [Introduced in North America]
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Discussion | First collected in North America in 1966 in Washington, Cerastium dubium has now been gathered from many widely scattered sites, and appears to be spreading rapidly. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
The wholly herbaceous bracts of Cerastium brachypetalum distinguish it from C. fontanum subsp. vulgare, C. semidecandrum, and C. pumilum; the ciliate petal and filament bases distinguish it from C. diffusum and C. glomeratum. Cerastium brachypetalum differs from all those species in the long, silvery hairs that give it a grayish appearance. In Europe C. brachypetalum is more variable and eight subspecies have been recognized, two of which—subsp. brachypetalum and subsp. tauricum—occur in North America. However, they differ only in the absence or presence of glandular hairs, an insufficient distinction for recognition at the subspecific level. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 5, p. 85. | FNA vol. 5, p. 82. |
Parent taxa | Caryophyllaceae > subfam. Alsinoideae > Cerastium | Caryophyllaceae > subfam. Alsinoideae > Cerastium |
Sibling taxa | ||
Synonyms | Stellaria dubia, C. anomalum, Dichodon viscidum | C. brachypetalum subsp. tauricum, C. tauricum |
Name authority | (Bastard) Guépin: Fl. Maine et Loire ed. 2, 1: 267. (1838) | Persoon: Syn. Pl. 1: 520. (1805) |
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