Cerastium glomeratum |
Cerastium axillare |
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céraiste aggloméré, large mouse ears, sticky chickweed, sticky mouse-ear chickweed |
Trans Pecos mouse-ear chickweed, trans-Pecos chickweed |
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Habit | Plants annual, with slender taproots. | Plants annual, viscid. |
Stems | erect or ascending, branched, 5–45 cm, hairy, glandular at least distally, rarely eglandular; small axillary tufts of leaves absent. |
usually erect, simple or several-branched, from branched caudex, rarely bushy, 6–40 cm, glandular-pilose, hairs in mid-stem region equaling or longer than stem diam.; small axillary tufts of leaves absent Leaves sessile; blade 7–25 × 1–6 mm; basal rosette absent or poorly developed and withering when young; proximal with blade oblanceolate to spatulate; distal with blade linear-lanceolate or lanceolate to narrowly elliptic, apex usually acute, rarely obtuse, glandular-pilose. |
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. |
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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. |
diffuse, elongate, usually with single dichotomy at or below mid stem, 3–18-flowered cymes, glandular-pubescent, flowers widely and racemosely spaced in axils of paired bracts along each branch; bracts herbaceous, lanceolate, glandular-pubescent. |
Pedicels | erect to spreading, often arcuate distally, 0.1–5 mm, shorter than capsule, glandular-pubescent. |
sharply curved just below capsule, 2–10(–15) mm, shorter than to 2 times as long as capsule, with dense, patent, 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, 3–5 mm, apex acute, glandular-hispid, hairs not extending beyond sepal tips, inner sepals with broad margins, outer sepals with very narrow margins; petals oblanceolate, 2–3 mm, shorter than sepals, apex 2-fid ca. 1/4 of length; stamens 5; styles 5. |
Capsules | narrowly cylindric, curved, 7–10 mm; teeth 10, erect, margins convolute. |
narrowly cylindric, curved, 7–8.5 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. |
light brown, 0.4–0.7 mm diam., tuberculate; testa not inflated. |
2n | = 72. |
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Cerastium glomeratum |
Cerastium axillare |
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Phenology | Flowering throughout growing season. | Flowering summer. |
Habitat | Arable land, waste places, roadsides | Rocky canyons, woodland and mountain slopes |
Elevation | 0-1800 m (0-5900 ft) | 1300-2800 m (4300-9200 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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NM; TX; Mexico |
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 axillare is similar to C. brachypodum in its short pedicels, but it is more viscid-pubescent, with a much more diffuse habit and solitary flowers widely spaced along the elongate, racemelike primary branches of the inflorescence. In addition, the leaves are usually acute, whereas in C. brachypodum they are usually obtuse. Cerastium axillare is confined in the United States to the trans-Pecos mountains of Texas and New Mexico. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 5, p. 87. | FNA vol. 5, p. 81. |
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) | Correll: Brittonia 18: 308. (1967) |
Web links |
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