Description from Flora of China
Achillea mongolica Fischer ex Sprengel; A. sibirica Ledebour; A. sibirica subsp. mongolica (Fischer ex Sprengel) Heimerl; A. sinensis Heimerl; Ptarmica mongolica (Fischer ex Sprengel) Candolle; P. sibirica (Ledebour) Ledebour.
Herbs, perennial, 30-80 cm tall, with short rhizomes; stems erect, branched in upper part, usually with sterile branches at leaf axils above middle, sparsely or densely pilose. Basal stem leaves withered by anthesis. Middle stem leaves sessile; leaf blade linear-lanceolate, 6-10 × 0.7-1.7 cm, pectinately pinnatilobed or pinnatipartite, abaxially densely villous, adaxially sparsely villous; lobes linear or linear-lanceolate, basally amplexicaul, margin unequally serrulate, apex acute; upper stem leaves similar, progressively smaller. Synflorescence a dense terminal flat-topped panicle. Capitula many. Involucres broadly oblong or subglobose, (4-)5-7 mm in diam.; phyllaries in 3 rows, broadly lanceolate to elliptic, 2-4 × 1.2-2 mm, abaxially sparsely villous, scarious margin brown, midvein convex. Paleae similar to phyllaries. Ray florets 6-8; lamina white, broadly elliptic, apex 3-denticulate. Disk florets white, 5-lobed. Achenes broadly oblanceolate, ca. 2 × 1.1 mm, with white lateral ribs, sometimes 1- or 2-ribbed abaxially. Corona absent. Fl. and fr. Jul-Sep. 2n = 36.
Grasslands on mountain slopes, forest margins, under thickets, meadows, river valleys; 800-2400 m. Anhui, Gansu, Hebei, Heilongjiang, Jilin, Liaoning, Nei Mongol, Ningxia, Qinghai, Shaanxi, Shanxi, Sichuan, Yunnan [Japan, Korea, Mongolia, Nepal, Russia].