Plants terrestrial, erect, 2–9 dm. Leaves scattered along stem and gradually reduced distally, or occasionally grouped toward base and abruptly reduced to bracts; blade wide-spreading to ascending, elliptic-oblong to oblanceolate, 5–25 × 2–6 cm. Inflorescences: floral bracts ascending to appressed, foliaceous, ovate to lance-acuminate, 15–28 × 7–15 mm. Flowers ascending, showy; sepals green; dorsal sepal shallowly concave, 6–13 × 5–10 mm; lateral sepals descending-spreading, 8–16 × 4–7 mm; petals white, lamina ascending, falcate, 6–15 × 2 mm, lateral lobe spreading-recurved, filiform, nearly equal to more than 2 times length of petal; lip white, middle lobe descending, linear, 8–20 × 2–3 mm, lateral lobes spreading, descending, filiform, nearly equal to more than 2 times middle lobe, apices recurved; spur slender, often markedly clavate, 4–18 cm; ovaries 2–3 cm. Capsules on short pedicel, nearly erect, 15–30 × 5–10 mm.
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