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Noun: tansy leaf aster
  1. Wild aster with fernlike leaves and flower heads with very narrow bright purple rays; Alberta to Texas and Mexico
    "tansy leaf asters coloured the desert purple";
    - tahoka daisy, Machaeranthera tanacetifolia

Derived forms: tansy leaf asters

Type of: wild flower, wildflower

Part of: genus Machaeranthera, Machaeranthera