The fleabanes are mainly alpine plants, with neat daisy flowers, usually less showy than asters, but making up for it by having lots of flowers. These have a tight central disc, yellow, surrounded by lots of slender ray florets, white or mauve in most species, although there are fine yellow varieties.

Erigeron leiomerus has flowers that are usually deep blue, but sometimes white, one on each short, upright stem, above tufts of narrow, spoon-shaped leaves.