Cotula australis |
Cotula coronopifolia |
|
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Australian cotula, Australian water-buttons, brass buttons |
brass-buttons, buttonweed, common brass-buttons, cotule, golden buttons |
|
Habit | Annuals, 2–10(–25+) cm. | Perennials, (3–)5–15(–25+) cm tall or across. |
Stems | branched ± throughout, ± strigillose to villous, glabrescent. |
prostrate (rooting at nodes, ± fleshy) to decumbent or erect, glabrous. |
Leaves | petiolate or sessile; blades obovate to spatulate, 2–3-pinnately lobed (ultimate lobes narrowly spatulate to linear), (1–)2–3(–6) cm. |
sessile (bases sheathing stems); blades linear to lanceolate or oblong (sometimes lobed, lobes lanceolate to linear), (1–)2–3(–7) cm, ultimate margins entire or irregularly toothed or lobed, faces gland-dotted. |
Involucres | 3–4(–6) mm diam. |
6–9(–12+) mm diam. |
Ray florets | 0 (peripheral pistillate florets 8–80+ in 1–3+ series; corollas 0). |
0 (peripheral pistillate florets 12–40+ in 1 series; corollas 0). |
Disc corollas | ochroleucous to pale yellow, 0.5–0.8 mm. |
yellow, 1–1.5 mm. |
Phyllaries | 13–22+ in 2–3 series, subequal (apices brown). |
21–30+ in 2–3+ series. |
Cypselae | outer stalked, 1–1.2 mm, ± winged, faces ± papillate; inner sessile, 0.8–1 mm, not winged, not papillate. |
outer 1.2–1.8 mm, winged, adaxial faces papillate; inner 0.7–1 mm, scarcely, if at all, winged, not papillate. |
2n | = 36, 40. |
= 20. |
Cotula australis |
Cotula coronopifolia |
|
Phenology | Flowering Jan–Sep. | Flowering Mar–Dec. |
Habitat | Disturbed sites | Saline and freshwater marshes, along streams |
Elevation | 0–800 m (0–2600 ft) | 0–900 m (0–3000 ft) |
Distribution |
AZ; CA; FL; ME; OR; TX; South America; Australia; Africa [Introduced in North America; also introduced in Northern Hemisphere: Mexico (Baja California)]
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AK; AZ; CA; MA; MD; NV; OR; WA; BC; NB; NS; PE; QC; South America; S Africa; Australia; Europe [Presumed introduced; also introduced in Mexico (Baja California)]
|
Source | FNA vol. 19, p. 544. | FNA vol. 19, p. 544. |
Parent taxa | Asteraceae > tribe Anthemideae > Cotula | Asteraceae > tribe Anthemideae > Cotula |
Sibling taxa | ||
Synonyms | Anacyclus australis | |
Name authority | (Sieber ex Sprengel) Hooker f.: Fl. Nov.-Zel. 1: 128. (1852) | Linnaeus: Sp. Pl. 2: 892. (1753) |
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