Aster L. >

Leaves glabrous. Rays conspicuous Aster
Involucre 5–7 mm diam. Leaves 12–20 mm wide, 6–8 cm long, sessile, stem-clasping, lanceolate, usually with a few small teeth. Rays blue-purple. Rhizomatous perennial up to 30 cm high. Widespread. Weed near habitation. Introd. from Europe. Michaelmas Daisy or Easter Daisy Aster novi-belgii