Tanacetum L.
Leaves pinnatisect, c. 10 cm long and 6 cm wide; ultimate segments c. 2 mm wide, often toothed. Heads numerous, 6–7 mm diam. Florets yellow. Ray scarcely developed. Cypselas 1–2 mm long. Strongly scented perennial up to 1 m high. Widespread. Garden escape near habitation. Introd. from the Mediterranean. Fl. summer. Tansy Tanacetum vulgare
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