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Perennial herb from tubers, 1-4 cm long, with a few fibrous roots; stems 15-55 cm tall, 1-3 mm wide.
Basal 2 to 5, oblanceolate, 6-18 cm long, 1-4 cm wide; stem leaves bractlike.
Inflorescence a terminal, spikelike raceme, 7-25 cm long, open to densely-flowered, the flowers small, white to yellowish, clovelike scent noticeable in evenings; sepals 2-5.5 mm long, lanceolate, the midvein green, the upper sepal pointed forward; petals 2-5.5 mm long, lanceolate, the midvein green, spreading, somewhat bent back; lip 2.5-5 mm long, oblong to somewhat egg-shaped, white, pointed forward or down; spur 6-10 mm long, horizontal, straight, pointed backward.
Capsules, ascending to erect.
Where P. candida, P. elongata, and P. transversa grow together, P. transversa blooms first.
Source: The Illustrated Flora of British Columbia