Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast.
Habitat: Noxious weed in fields and waste ground in eastern Washington.
Flowers: June-September
Origin: Introduced from Europe
Growth Duration: Annual
Conservation Status: Not of concern
Pollination: Bees, flies, beetles, wasps
Glabrous annual, biennial or occasionally perennial, nearly scentless herb, 1-6 dm. tall.
Leaves 2-8 cm. long, bipinnatifid, the ultimate segments mostly elongate, linear or liner-filiform.
Heads several or numerous, the disk 8-15 mm. wide; involucral bracts dry, in 2 series, the margins translucent; rays 12-25, white, 6-13 mm. long; disk flowers yellow, 5-toothed; receptacle hemispheric, naked; pappus a short crown.
Achenes roughened, with 2 marginal and 1 ventral thickened ribs.
Publication: Tanaceteen. 32. 1844.
Matricaria maritima L. ssp. inodora (L.) Soó
Matricaria perforata Mérat
Tripleurospermum maritimum (L.) W.D.J. Koch ssp. inodorum (L.) Applequist
Tripleurospermum perforatum (Mérat) M. Lainz
PNW Herbaria: Specimen records of Tripleurospermum inodorum in the Consortium of Pacific Northwest Herbaria database.
WA Flora Checklist: Tripleurospermum inodorum checklist entry.
OregonFlora: Tripleurospermum inodorum information.
E-Flora BC: Tripleurospermum inodorum atlas page.
CalPhotos: Tripleurospermum inodorum photos.
USDA Plants: Tripleurospermum inodorum information.
