General:
Annual herb from a taproot; stems erect, winged, ridged, branched, 15-70 cm tall.

Leaves:
Basal leaves oblanceolate, toothed to lobed, hairy; stem leaves becoming lanceolate to linear-oblong, entire and reduced.

Flowers:
Heads discoid, few to numerous, solitary or 2-5 at the ends of branches; involucres 8-15 mm tall, nearly as wide; involucral bracts glabrous, the outer ones leathery, with a 5-9 mm terminal spine bearing 2-3 pairs of short, lateral spines; disk flowers bright yellow, all tubular and perfect, 8-11 mm long.

Fruits:
Achenes grey, with regular narrow, longitudinal stripes, 1-3 mm long; pappus white, 2.5-3 mm long.

Source:  The Illustrated Flora of British Columbia

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Illustration Source:  The Illustrated Flora of British Columbia