裸柱菊 luo zhu ju

Gymnostyles anthemifolia Jussieu, Ann. Mus. Natl. Hist. Nat. 4: 262. 1804.

Stems very short, prostrate, rooting adventitiously. Leaves alternate, in basal rosettes, spatulate in outline, 5-15 × 1-3 cm overall; petiole 2-3 cm; leaf blade 2- or 3-pinnatifid; ultimate lobes linear, sparsely villous or subglabrous. Capitula at base of stem, sessile, 6-12 mm in diam. Involucres hemispheric, 5-8 × 6-10 mm; phyllaries in 2 or 3 rows, oblong or lanceolate, margin scarious, apex acuminate, outer ones 3-3.5 × 1-1.2 mm, inner ones 3-4 × 0.3-0.6 mm. Marginal female florets in several rows, corolla absent, styles persistent; disk florets 8-12, corolla yellow, tubular, ca. 1.2 mm, apex 3-lobed; style apex capitate. Achenes oblanceolate, 2-2.5 × 0.1-1 mm, dorsiventrally flattened, with thick corky lateral wings, apex long villous, rounded; style persistent, spinescent. Pappus absent. Fl. and fr. year-round. 2n = 18.

Naturalized in waste ground and cultivated areas. Fujian, Guangdong, Hainan, Jiangxi, Taiwan, Zhejiang [native to South America].