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Flat-topped aster produces stems that are 2-5' tall and unbranched except at the inflorescence, a flat-topped cluster of small (1/2"-3/4") white flowers with few (2-15) broad but sparse ray florets ("petals"). The disc florets are initially yellow but become cream-colored with age. The branching of each stem produces a flat-topped panicle of flowerheads that is 3-12" across. Individual flowerheads are small (1/2-3/4" across) with 5-12 white ray florets around 12-25 yellow disc florets (but these may fade to a yellowish-tan color as the disc florets age). The base of each flowerhead is surrounded by appressed, oblong bracts ("phyllaries") in 2-4 layers ("series").

Doellingeria

Doellingeria umbellata

flat-topped aster [Blooms: Jul – Sep]