Achillea millefolium

The following description is from Flora of North America Editorial Committee, 2015;Perennials, 6Ð65+ cm (usually rhizomatous, sometimes stoloniferous). Stems 1(Ð4), erect, simple or branched, densely lanate-tomentose to glabrate. Leaves petiolate (proximally) or sessile (distally, weakly clasping and gradually reduced), blades oblong or lanceolate, 3.5Ð35+ cm ? 5Ð35 mm, 1Ð2-pinnately lobed (ultimate lobes ± lanceolate, often arrayed in multiple planes), faces glabrate to sparsely tomentose or densely lanate. Heads 10Ð100+, in simple or compound, corymbiform arrays. Phyllaries 20Ð30 in ± 3 series, (light green, midribs dark green to yellowish, margins green to light or dark brown) ovate to lanceolate, abaxial faces tomentose. Receptacles convex, paleae lanceolate, 1.5Ð4 mm. Ray florets (3Ð)5Ð8, pistillate, fertile, corollas white or light pink to deep purple, laminae 1.5Ð3 ? 1.5Ð3 mm. Disc florets 10Ð20, corollas white to grayish white, 2Ð4.5 mm. Cypselae 1Ð2 mm (margins broadly winged).