General:
Insectivorous perennial herb from a fibrous root; stems erect, 20-40 cm tall.

Leaves:
Basal leaves clustered, hollow, often marked with purple or dark red, open at the top or with a kidney-shaped flap, with bentback hairs inside the flap and tube.

Flowers:
Inflorescence a solitary flower; petals usually egg-shaped, deep purple on both sides, 2-6 cm long; sepals egg- to diamond-shaped, dark purple outside, pale green inside, 2-6 cm long.

Fruits:
Capsules.

Source:  The Illustrated Flora of British Columbia