Plants erect, 25–71 cm. Leaves 4–6, inserted toward base or scattered along stem, alternate, erect, ascending, or spreading; blade suborbiculate or broadly ovate to elliptic-lanceolate, 3.3–17 × 2.5–9.5 cm. Flowers 1–3; sepals greenish, suffused, often heavily, with reddish brown or madder, or rarely clear green; dorsal sepal lance-acuminate to elliptic-lance-acuminate, 33–60 × 8–16 mm; lateral sepals connate; synsepal 30–60 × 6–18 mm; petals spreading-deflexed, same color as sepals, spirally twisted, linear to linear-lanceolate, 36–77 × 3–5 mm; lip white, rarely suffused with magenta, obovoid or oblance-ovoid to oblance-fusiform, 19–33 mm; orifice basal, 13–22 mm; staminode lanceoloid to broadly ovoid or ellipsoid-ovoid.
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