Perennial herbs, epiphytes or saprophytes may be terrestrial; flowers zygomorphic, hermaphrodite, epigynous, resupinated; perianth 6 in two whorls, the posterior segment of the inner whorl developed as lip or labellum; presence of peculiar structures – Labium, column and Rostellum; Stamens 1-2, one or two staminode pollengrains united into pollinia; gynoecium tricarpellary, inferior unilocular with parietal placentation; the fertile stamen is adherent to the style and forms with it the column or gynostemium, which projects more or less in the centre of flower; Stigma 2 or 3 lobed, in some two fertile and one sterile and modified into rostellum.


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