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Genus :


Family :



Small, epiphytic herbs. Stems short, covered with distichous, equitant leaves. Leaves iridiform, unifacial, rarely terete, fleshy, articulate or not at base, often imbricate at base, sheaths flattened. Inflorescences terminal, slender, unbranched, many flowered spikes; peduncle often with sterile bracts below; floral bracts persistent, oblong, erose. Flowers in whorls, minute, 1-2 mm across, greenish-yellow or red; ovary glabrous or papillate. Sepals and petals ovate, deflexed, free. Lip entire or lobed, with a nectar depression at base; lateral lobes often embracing column. Column erect, short, lacking a foot; anther cap terminal, firmly attached to column apex, 2-locular; pollinia 4, cohering in 2 unequally sized pairs, waxy. Stigma transversely reniform to ovate. Capsule globose or elliptic.

Key to the species

Serial Key Reference
1a. No distinct stem O. mucronata
1b. Stem distinct elongate entirely leafy 2
2a. Floral bracts broadly elliptic; sepals ovate-oblong, 1.4-1.5 mm long; lip orbicular-ovate O. rufilabris
2b. Floral bracts oblong-lanceolate; sepals ovate or oblong-ovate, 0.8-1.0 mm long; lip oblong O. falconeri