Distribution: Occurring in scattered locations on both sides of the Cascades crest in Washington; British Columbia to California, east in sporadic occurrences to the Atlantic Coast.
Habitat: Roadsides, fields, wastelots, and other disturbed sites.
Origin: Introduced from Europe
Conservation Status: Not of concern
Aromatic annuals, the 1-8 stems erect to ascending, 8-60 cm. tall, often branched upward.
Leaves alternate, bipinnatifid, 2-8 cm. long, the ultimate segments elongate, linear to filiform.
Heads 8-120, borne singly, with ray flowers; peduncles 20-50 mm. long; involucral bracts 34-42, in 3 series, the margins mostly entire; ray flowers 14-26, white, the tubes narrowly winged, 7-8.5 mm. long and 2.5-3.3 mm. wide; disk flowers 250-570, the corollas yellow to greenish-yellow, 5-lobed; pappus usually none.
Achenes tan, obconic, 0.75-0.9 mm. long, with 5 white ribs.