Anthemis nobilis Linnaeus, Sp. Pl. 2: 894. 1753

Perennials, 10–20(–30) cm across. Stems mostly prostrate (much branched, often forming mats), ± strigoso-sericeous to villous. Leaves sessile; blades oblong, 1–3(–5) cm, 2–3-pinnately lobed. Involucres 4–6 × 7–10+ mm. Phyllaries: margins and apices greenish or lacking pigment, abaxial faces ± villous. Paleae 3–4+ mm, margins greenish or lacking pigment. Ray florets usually 13–21+, rarely 0; laminae 7–10+ mm. Disc corollas 2–3 mm. Cypselae 1–1.5 mm. 2n = 18.

Flowering Jul–Aug. Disturbed sites; 10–300 m; introduced; Calif., Conn., Del., Ill., Ind., Md., N.J., N.Y., N.C., Ohio, Wis.; Europe.