Description from Flora of China
Achillea impatiens subsp. euimpatiens Heimerl; Ptarmica impatiens (Linnaeus) Candolle.
Herbs, perennial, 40-60 cm tall, with short rhizomes; stem erect, few branched in upper part, pubescent above middle. Middle stem leaves sessile; leaf blade lanceolate, 1.5-4.5 × 0.3-0.9 cm, both surfaces sparsely pilose; rachis 1-2 mm wide, segments linear-lanceolate, margin entire, minutely serrulate or with 1 or 2 teeth on one side, apex acute. Upper stem leaves similar, gradually smaller. Synflorescence a terminal flat-topped cyme. Capitula 5-8 or more. Involucre hemispheric, 5-7 mm in diam.; phyllaries in 3 rows, broadly lanceolate, 3.5-4.5 × ca. 1.8 mm, abaxially sparsely villous, margin scarious, midvein convex, red-brown or deep brown. Paleae lanceolate, apex sparsely villous. Ray florets 8; lamina white, broadly elliptic, apex 3-crenate. Disk florets white, tubular. Achenes oblanceolate, ca. 2.5 × 1.3 mm, with winged lateral ribs. Corona absent. Fl. and fr. Jul-Aug. 2n = 18.
Forest margins, riverbanks; 1500-2000 m. Xinjiang [Kazakhstan, Mongolia, Russia].