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

General:
Annual, ill-scented herb from a taproot; stems erect, leafy, simple or branched, essentially glabrous, 10-60 cm tall.

Leaves:
Alternate, 2-3 times divided into narrow, sparsely hairy, glandular dotted segments.

Flowers:
Heads solitary at ends of uppermost branches; involucres broad; involucral bracts in several rows, overlapping, firm, narrow, with a thickened midrib and translucent margins; receptacles with papery scales only in the middle; ray flowers white, sterile and generally neutral, commonly 10-20, 5-10 mm long; disk flowers yellow, numerous.

Fruits:
Achenes slightly flattened, 10-ribbed, glandular bumpy; pappus lacking.