线叶菊 xian ye ju

Tanacetum sibiricum Linnaeus, Sp. Pl. 2: 1844. 1753; Artemisia sibirica (Linnaeus) Maximowicz; Chrysanthemum trinioides Handel-Mazzetti.

Herbs, perennial, 20-60 cm tall, roots robust, woody; base densely clothed by old fibrous leaf sheaths; stems solitary or few and tightly clustered, corymbosely branched in upper parts, striate, glabrous. Basal leaves long petiolate; leaf blade obovate or oblong in outline, ca. 20 × 5-6 cm, 2(or 3)-pinnatisect, both surfaces green, glabrous; primary lateral segments many paired; ultimate segments filiform, alternate. Synflorescence a flat-topped cyme; capitula 1-10(-15). Involucres hemispheric, 4-5 mm in diam.; phyllaries in 3 rows, ovate to broadly ovate, margin scarious, apex rounded. Florets yellow. Marginal female florets 6; corolla ascidiform, tapering above, minutely 2-4-denticulate, exterior with sessile glands. Disk florets many, tubular, ca. 2 mm, 5-lobed. Achenes dark, obovate or elliptic, slightly compressed, glabrous, 2-striate adaxially. Fl. and fr. Jun-Sep. 2n = 16, 18.

Grasslands on mountain slopes; 1500-2600 m. Hebei, Heilongjiang, Jilin, Liaoning, Nei Mongol, Shanxi [Japan, Korea, Mongolia, Russia (Siberia)].