Distribution | Paleotropical, from Africa, Madagascar, India, and the southern Ryukyu Islands eastward through Malesia into portions of Micronesia and to Tonga, Niue, and Samoa, with approximately 70 species.
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Flowers
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Inflorescences terminal, erect, densely to laxly racemose, usually many-flowered; flowers small (perianth 0.5-1 cm. long), resupinate; dorsal sepal frequently connivent with petals forming a hood over column; lateral sepals erect or spreading; petals entire, usually somewhat oblique; labellum more or less adnate to front of column, entire, the base saccate or cymbiform, with 2 or more small glands within, either abruptly contracted at apex or narrowed to form a short claw, the apex abruptly widened into a small, transverse blade, the disk either naked or callose above base; column short, with or without lamellate appendages along ventral surface; anther dorsal, erect, persistent, 1-celled; pollinia 2, sectile, clavate, the caudicles turned toward top of anther and joined to a broad common stipe, the viscidium relatively large; rostellum prominent, rather broad, deeply divided into 2 erect laciniae; stigmas 2, remote from one another on each side of column, convex and sometimes papillose; ovary erect, twisted.
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