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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
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