Habit: epiphytic herbs
Stem: with scalelike sheath or roots
Leaf: characteristics: sheathing or noding at base
Leaf: position: in two rows
Inflorescence: position: laterally on stem
Inflorescence: other characteristics: unbranched
Sepal: lateral sepals adnate to column foot or labellum forming a mentum
Labellum: 5-lobed
Column: with wing or triangular-falcate or arm-shaped or subulate appendages, with column foot
Pollinia: number: 4
Pollinia: other characteristics: with caudicle or viscidium, with stipe
Viscidium:shape: ovate
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