Tanacetum L. >
Leaves pinnate; the segments toothed or pinnatifid; largest leaves (lowest) up to 7 cm long, almost glabrous. Heads numerous, massed together. Ray white, 10–15 mm long. Disc florets yellow. Cypselas 1 mm long. Scented perennial up to c. 70 cm high. Sydney; Blue Mts Garden escape near habitation; roadsides. Fl. summer. Pyrthrum or Feverfew Tanacetum parthenium