Disk flowers only, other colors than yellow Asteraceae
This group has no ray flowers and disk flowers with blue, white or other colors. The flowerheads are growing individually or in clusters.
Guide to Identify Presented Species of this group
FLOWERS PINK OR PURPLE. INVOLUCRAL BRACTS FRINGED OR PAPERY.
Centaurea maculosa Spotted Knapweed Rough-hairy, branched biennial. Noxious weed in fields and roadsides.
Flowerheads pink-purple, 2-2.5 cm wide. Involucral bracts with dark, fringed tips.
Leaves alternate, pinnate with thin, narrow lobes, or reduced upper ones entire.
FLOWERHEADS PURPLE, IN DENSE CLUSTERS
Liatris punctata Dotted Blazingstar Plant 10-40 cm tall, hairless with several stems. Dry, open places, roadsides.
Flowerheads purple, with 4-6 large disk florets, in dense, tall and narrow clusters.
Leaves alternate, numerous, narrow, dotted with tiny pits, rough-hairy on edges.