Platanthera bifolia

Perennial herb.

50–150 cm high.

The stem is erect and stout.

There are two opposite leaves at the base of the stem. The basal leaves are 6–18 cm long and obovate to elliptic. There are 1–3 narrow hypsophylls further up on the stem.

The root tubers are unbranched.

The inflorescence is a spike. The flowers are white, zygomorphic, spurred and mostly fragrant at night. The spur is 25–40 mm long, thin and acuminate. The labellum is about 12 mm long, narrow and entire. The halves of the anther are parallel and close to each other.

The fruit is a capsule (12-15 mm).