1. Cotula anthemoides Linnaeus, Sp. Pl. 2: 891. 1753.
芫绥菊 yuan sui ju
Herbs, annual, small. Stems with diffuse branches, ± villous with pale brown hairs. Basal leaves petiolate; leaf blade oblanceolate-oblong, 3-5 × 1-2 cm, both surfaces sparsely villous or subglabrous, 2-pinnatisect; primary lateral segments 5-paired; ultimate segments shortly triangular or lanceolate, apex shortly acute. Middle stem leaves similar, base semiamplexicaul. Capitula solitary at apex of branches, axillary or opposite with leaves, ca. 5 mm in diam. Involucres cup-shaped; phyllaries in 2 rows, oblong, with 1 red midvein, margin scarious, outer ones small, inner ones large. Marginal female florets many, without corolla; disk florets few, corolla yellow, 4-lobed. Achenes obovoid, ca. 1.2 mm, dorsiventrally flattened, lateral wings broad and thick, with sessile glands. Pappus absent. Fl. and fr. Sep-Mar of next year. 2n = 20.
Wet places by rivers, paddies; 1000-1100 m. Fujian, Guangdong, Hubei, Sichuan, Taiwan, Yunnan [Cambodia, India, Indonesia, Laos, Myanmar, Nepal, Pakistan, Thailand, Vietnam; Africa].