Description from Flora of China
Achillea sibirica Ledebour var. discoidea Regel; A. sibirica subsp. ptarmicoides (Maximowicz) Heimerl; A. sibirica var. ptarmicoides (Maximowicz) Makino; Ptarmica ptarmicoides (Maximowicz) Voroschilov.
Herbs, perennial, 70-100 cm tall, with short rhizomes; stems erect, usually unbranched, middle leaf axils with sterile branches, sparsely white pilose. Basal stem leaves withered by anthesis. Middle stem leaves sessile; leaf blade linear or linear-lanceolate, 6-8 × 0.5-0.7 cm, pectinately pinnatipartite or subpinnatisect, abaxially sparsely pilose, adaxially densely pilose, densely glandular punctuate; pinnae linear, margin irregularly serrulate, apex acute. Upper stem leaves similar, gradually smaller. Synflorescence a dense terminal flat-topped panicle. Capitula many. Involucres campanulate, 5-6 × 3.5-4 mm; phyllaries in 3 rows, scarious margin yellowish or brownish, outer phyllaries ovate, 1.5-2 × 1.2-1.5 mm, apex somewhat acute, middle ones elliptic, ca. 2.8 × 1.5 mm, apex obtuse, inner ones oblong, ca. 3.2 × 2 mm. Paleae similar to phyllaries. Ray florets 6-8; lamina yellowish white, broadly elliptic, very small, 0.8-1.5 × ca. 1.1 mm, apex 3-crenate. Disk florets white, tubular, 5-lobed. Achenes oblong or broadly oblanceolate, ca. 2.2 × 1.2 mm, with white lateral ribs. Corona absent. Fl. and fr. Jul-Sep.
River valleys, meadows, mountain slopes, under thickets; 200-400 m. Hebei, Heilongjiang, Liaoning, Nei Mongol [Japan, Korea, Mongolia, Russia].