Costmary: Tanacetum balsamita (Synonyms: Chrysanthemum balsamita, Balsamita major) - Flower heads all discoid.
Dune Tansy: Tanacetum camphoratum (Synonyms: Tanacetum bipinnatum, Tanacetum bipinnatum ssp. huronense, Tanacetum douglasii) - Flower heads all discoid.
Feverfew, Fever-few, Featherfew, Feather-few: Tanacetum parthenium (Synonym: Chrysanthemum parthenium) - Flower heads contain disk flowers surrounded by a ring of white ray flowers.
Common Tansy: Tanacetum vulgare - Flower heads all discoid.