Plant: Plant 10-200 cm, perennial, strongly scented Leaves: alternate, very finely 3-pinnately divided, ± hairy, ± reduced upward; cauline leaves ± clasping Inflorescence: a head, each resembling a flower; heads generally radiate, many, in flat-topped clusters; involucre bell-shaped or ovoid; phyllaries graded in 3-4 unequal series, ovate, obtuse; margins membranous; receptacle flat to rounded; chaff scales narrow, transparent; phyllaries 4-9 mm Flowers: Ray flowers generally 3-8; ligules 2.5-4 mm, ovate to round, white to pink; Disk flowers 15-40; corollas 2-3 mm, white to pink Fruit: ± 2 mm achene, oblong to obovate, compressed, thick-margined, glabrous; pappus 0 Misc: Many habitats; < 3500 m.; Summer