Brass-buttons, cotule

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. Phyllaries 21–30+ in 2–3+ series. Ray florets 0 (peripheral pistillate florets 12–40+ in 1 series; corollas 0). Disc corollas yellow, 1–1.5 mm. 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.

Flowering Mar–Dec. Saline and freshwater marshes, along streams; 0–900 m; presumed introduced; B.C., N.B., N.S., P.E.I., Que.; Alaska, Ariz., Calif., Md., Mass., Nev., Oreg., Wash.; S Africa, Australia; also introduced in Mexico (Baja California); South America; Europe.