4. Achillea millefolium Linnaeus, Sp. Pl. 899. 1753; Hook. f., Fl. Brit. Ind. 3: 312. 1881; R.R.Stewart, Ann. Cat. Vasc. Pl. W. Pak. & Kashm. 711. 1972; Tsiang & Li, Icon. Corm. Sin. 4: 500. fig. 6414. 1975; Hub.-Mor. in P.H.Davis, Fl. Turk. 5: 244. f. 11. 1975; I.Richardson in Tutin et al., Fl. Europ. 4: 162. 1976; Hub.-Mor. in Rech. f., Fl. Iran. l. c. 62. tt. 62-64. 1986; Afan. in Schischk. & Bobrov, Fl. USSR 26: 72. 2000 (Engl. transl.); Grierson & Springate, l.c. 1566. 2001.
Erect, up to 1 m tall, basally woody shrublet with obtuse-angled, punctate-glandulose, woolly pilose twigs. Leaves long-petiolate, green, homomorphic, cauline akin to basal, laxly to densely long soft hairy, linear-lanceolate to oblong, up to 20 x 1 – 4 cm, smaller above, punctate-glandulose, 2–3-pinnatisect, rachis 0.4 – 1.5 mm wide; primary segments numerous, linear to linear-lanceolate; ultimate segments narrowly linear filiform, 0.2 – 0.5 (-1) mm wide, cartilaginous mucronate. Capitula 5 – 6 mm across, up to 150 or sometimes more, on 2 – 5 mm long peduncles, in 5 – 15 cm broad compound corymbs. Involucre oblong to ovoid, 4.5 – 5 x 2.5 – 4 mm, basally rotundate, phyllaries oblong to lanceolate, ± acute to obtuse and laciniate, rarely carinate, pink to brownish scarious on margins. Paleae whitish membranous, with green midrib, lanceolate, obtuse and ± fimbriate, upwards pilose. Ray-florets 4 – 6, with whitish or pale-white, 3-lobed, 1.5 – 2.5 x 1.5 – 3 mm, reflexed limb. Disc-florets 10 – 20, with 2 – 3 mm long, 5-toothed corolla tube. Cypselas oblong, ± flattened, c. 2.5 mm long, glaucous-glabrous, epappose.
Two subspecies are recognized in our region.
