[Members of the Sunflower Family with Discoid Flower Heads Found East of the Cascade Mountains of Oregon and Washington]

The Genus Matricaria

Wild Chamomile, Sweet False Chamomile: Matricaria chamomilla (Synonym: Matricaria recutita) - Flower heads with both disc and ray flowers.

Disc Mayweed, Pineapple Weed: Matricaria discoidea (Synonyms: Chamomilla suaveolens, Matricaria matricarioides) -

Scentless Mayweed, Scentless Chamomile: Tripleurospermum inodorum (Synonyms: Matricaria maritima, Matricaria perforata, Tripleurospermum perforatum) - Flower heads with both disc and ray flowers.

Valley Pineapple Weed: Matricaria occidentalis (Synonym: Chamomilla occidentalis) -