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Epiphytic, perennial herbs. Rhizome long, creeping, bearing a series of well spaced to clustered pseudobulbs. Leaves 1 or rarely 2 or 3, arising from apex of pseudobulbs; leaf blade leathery. or rhizome node; inflorescence racemose or umbellate, 1- to many flowered. Flowers small to large. Sepals unequal in size; lateral sepals free or connate, base adnate to column foot. Petals free; lip often hinged to end of column foot, fleshy, recurved. Column short, winged; anther 2-locular, sometimes 1-locular; pollinia 4, in 2 pairs, waxy, sometimes attached to sticky substance.

Key to the species

Serial Key Reference
1a. Inflorescence carrying single flowers 2
1b. Inflorescence many flowered racemes 3
2a. Leaves linear-oblong, 10-20 cm long; flowers 5-10 mm across, deep yellow marked with purple streak B. lobbii
2b. Leaves elliptic-oblong, 1.5-2.5 cm long; flowers 0.5-0.8 cm across, yellowish-white B. clandestinum
3a. Inflorescence erect racemes 4
3b. Inflorescence drooping racemes B. neilgherensis
4a. Flowers yellow with reddish-brown streaks; petals obliquely-lanceolate B. lilacinum
4b. Flowers orange-yellow with brown venation; petals obliquely triangular B. orientale