Habit: epiphytic herbs
Rhizome: with fibrous roots
Leaf: characteristics: 2, petiolate
Inflorescence: type: raceme
Inflorescence: other characteristics: rachis pubescent or zigzagged flexuose or winged
Sepal: lateral sepals dilated or saccate at base or bent downward, lateral sepals spreading or oblique or reflexed or connivent
Labellum: with sac or spur or auricles at base
Column: with wing or triangular-falcate or arm-shaped or subulate appendages, without column foot
Rostellum: ligulate or ovate or U-shaped or deltoid
Pollinia: number: 4
Fruit:type: capsule
Fruit: other characteristics: with persistent column
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