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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.
Aleksoff, Keith C. 1999. Achillea millefolium. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/plants/forb/achmil/all.html . The scientific name of common yarrow is Achillea millefolium L. (Asteraceae) [26,36,44,73]. There are both native and introduced phases of common yarrow in North America. Introduced and native phases differ primarily in chromosome number and are difficult to distinguish morphologically [26,73]. Native and introduced phases hybridize. The intricate pattern of morphologic, geographic, and ecologic variation within the species has frustrated all efforts to organize an intraspecific taxonomy on a circumboreal or even a strictly North American basis . Most authorities do not recognize infrataxa [26,73,74]; however, Kartesz  recognizes the following varieties:
Common yarrow is a perennial forb 11 to 40 inches (30-100 cm) in height with extensive rhizomes. It has few to numerous erect stems. The basal rosette of leaves may remain green throughout the winter . Plants grow in a somewhat scattered fashion and seldom form pure stands in areas larger than 5 square meters . Typical European Achillea millefolium is hexaploid with flat leaves. Native forms are mostly tetraploid, with narrow leaf-segments disposed in various planes so that the leaf is 3-dimensional . Aleksoff, Keith C., compiler. 1999. Effects of a wildfire on common yarrow at White Cap Creek, Idaho. In: Achillea millefolium. In: Fire Effects Information System, [Online]. U.S. Department of Agriculture, Forest Service, Rocky Mountain Research Station, Fire Sciences Laboratory (Producer). Available: https://www.fs.fed.us/database/feis/ . (Source: www.fs.fed.us)