Plants slender, 0.5-1.5(-1.9) dm. Leaves slightly dimorphic; basal 2, blade linear, 4-10(-20) cm × 0.8-1 mm; cauline 2-4, blade lanceolate, 1-5 × 0.1-0.2 cm. Flowers 1-2; tepals 0.9-1.2(-1.4) cm; stamens erect; filaments 3-8 mm; anthers 0.6-1(-1.2) mm. Capsules 6-8 mm.