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brass-buttons, buttonweed, common brass-buttons, golden buttons

Habit Perennials, (3–)5–15(–25+) cm tall or across.
Stems

prostrate (rooting at nodes, ± fleshy) to decumbent or erect, glabrous.

Leaves

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

6–9(–12+) mm diam.

Ray florets

0 (peripheral pistillate florets 12–40+ in 1 series; corollas 0).

Disc corollas

yellow, 1–1.5 mm.

Phyllaries

21–30+ in 2–3+ series.

Cypselae

outer 1.2–1.8 mm, winged, adaxial faces papillate;

inner 0.7–1 mm, scarcely, if at all, winged, not papillate.

2n

= 20.

Cotula coronopifolia

Phenology Flowering Mar–Dec.
Habitat Saline and freshwater marshes, along streams
Elevation 0–900 m [0–3000 ft]
Distribution
from FNA
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)]
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 19, p. 544.
Parent taxa Asteraceae > tribe Anthemideae > Cotula
Sibling taxa
C. australis
Name authority Linnaeus: Sp. Pl. 2: 892. (1753)
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