General:
Perennial herb from a slightly thickened taproot; stems erect, solitary, branched above, long-hairy, exuding milky juice when broken, 30-70 cm tall.

Leaves:
Basal leaves arrowhead-shaped, long-stalked, blades irregularly toothed, glabrous, 3.5-12 cm long, 0.5-11 cm wide; stem leaves similar below, middle and lower ones with winged stalks, becoming short-stalked or unstalked, reduced upwards.

Flowers:
Heads with strap-shaped flowers, numerous in a spikelike inflorescence; involucres 7-13 mm tall; involucral bracts lance-oblong, the principal ones linear, about 8, sparsely long-hairy; ray flowers white.

Fruits:
Achenes finely lined between the nerves, cylindric or tapering to the summit, glabrous, 4-6 mm long; pappus of brownish hairlike bristles.

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

Synonyms and Alternate Names:
Prenanthes alata var. sagittata Gray