E-Flora BC: Electronic Atlas of the Flora of British Columbia

General:
Annual, aromatic herb from a taproot; stems erect, leafy, simple or branched, hairy, 10-60 cm tall.

Leaves:
Alternate, 2 times divided into narrow, linear segments.

Flowers:
Heads solitary at ends of uppermost branches; involucres broad; involucral bracts in several rows, overlapping, firm, long-hairy, oblanceolate, with abruptly sharp-pointed tips; receptacles with papery scales throughout; ray flowers white, female and fertile, commonly 15-20, 7-13 mm long; disk flowers yellow, numerous.

Fruits:
Achenes quadrangular, 8- to 10-ribbed, the ribs smooth; pappus a minute crown or lacking.