Flowerheads have both ray flowers and disk flowers
Ray flowers have rays which are blue to purple, pink or white
Disk flowers are arranged in a distinctive head
Guide to Identify Presented Species of this group
BLUE TO WHITE RAYS. FLOWERHEADS 2 OR MORE
Aster – Aster Usually tall and leafy perennials with many flower heads per stem, flowering late.
Flowerheads mostly purple, pink or white, the bracts in overlapping rows.
Leaves alternate, not divided, usually lance-shaped and hairless.
Erigeron – Fleabane Annuals to perennials, with naked or leafy stems, 2-80 cm tall. Often dry sites.
Flowerheads solitary to several, often with very narrow rays and bracts in 1 row.
Leaves alternate, often also basal, simple or divided, hairless or hairy.
BLUE TO WHITE RAYS. FLOWERHEADS MOSTLY SOLITARY
Erigeron – Fleabane Annuals to perennials, with naked or leafy stems, 2-80 cm tall. Often dry sites.
Flowerheads solitary to several, often with very narrow rays and bracts in 1 row.
Leaves alternate, often also basal, simple or divided, hairless or hairy.
WHITE RAYS. FLOWERHEADS 2 OR MORE LEAVES SIMPLE
Leucanthemum vulgare – Oxeye Daisy Perennial 20-80 cm tall, stems single, often in colonies. Fields and roadsides.
Flowerheads white, about 5 cm wide, solitary, with 15-30 rays 1-2 cm long.
Leaves alternate, spoon-shaped, mostly hairless, narrowly lobed toothed.
