Chrysanthemum lineare Matsumura, Bot. Mag. (Tokyo) 13: 83. 1899; C. lineare var. manshuricum Komarov; Tanacetum lineare (Matsumura) Kitamura.

Herbs, perennial, 25-90 cm tall, with long procumbent rhizomes; stems erect, usually clustered, unbranched except for synflorescence, pubescent or glabrous. Basal and lower stem leaves withered by anthesis. Middle stem leaves sessile; leaf blade elliptic or lanceolate, 5-8 × 2-4 cm, pinnatipartite below middle, abaxially gland-dotted, adaxially asperous with acute papillae; terminal and lateral lobes ± linear, lateral lobes 1-3-paired. Synflorescence a terminal flat-topped cyme. Capitula 1-8, long pedunculate. Involucre coryliform, 1-1.5 cm in diam.; phyllaries in 2 or 3 rows, abaxially glabrous or nearly so, scarious margin brown or dark brown, outer phyllaries linear-lanceolate, inner ones narrowly elliptic. Ray florets: limb white, 1-2 cm, apex 2- or 3-denticulate. Disk florets yellow, 5-lobed. Achenes ca. 3 mm, with apical rim. Fl. and fr. Aug-Sep. 2n = 18.

Marshlands, wet grasslands. Heilongjiang, Jilin, Nei Mongol [Japan, Korea, Russia].