Cleisocentron includes six species collectively distributed in India (Sikkim), Bhutan, Burma, Vietnam, and Borneo.
Species of Cleisocentron are epiphytes, ranging in elevation from 330 to 3000 m. Cleisocentron abasii Cavestro occurs in forests on ultramafic substrate at 1200–1500 m in Borneo. Cleisocentron gokusingii J.J.Wood & A.L.Lamb occurs in mossy forests at 1800 m in Borneo. Cleisocentron kinabaluense D.Metusala & J.J.Wood occurs on mossy trees in shade in moss forest on ridges at 2400–3000 m in Borneo. Cleisocentron merrillianum (Ames) Christenson occurs in forests, sometimes on ultramafic substrates, at 1100–3000 m in Borneo. Cleisocentron pallens (Cathcart ex Lindl.) N.Pearce & P.J.Cribb occurs in forests at 330–2000 m in Sikkim.
Epiphytic herbs. Stems pendent or erect, simple or branching, up to 1 m in length. Leaves oblong, ligulate or terete, unequally bilobed or acute. Inflorescence supra-axillary, racemose. Flowers resupinate, pinkish white, various shades of blue, deep magenta or dark purple. Sepals and petals spreading. Labellum firmly adnate to column, urceolate, trilobed above; spur cylindrical, gently curving, interior containing either an upward-pointing, central protuberance on the back wall or a decurved shelf-like back wall callus; front wall callus flap-like; median septum absent. Column erect, cylindrical, foot decurrent on the back wall of labellum as a thickened cushion, or free; pollinia four, appearing as two, each completely divided into free halves, stipe long, linear, viscidium subquadrate; stigma oval, vertical; rostellum distinct, porrect or stiffly erect, bilobed, lobes broad.
Singchia is a monospecific and endemic to southwestern China.
Singchia malipoensis is epiphytic in broad-leaved forests at 1000 m.
Epiphytic herbs. Stem 6–8 cm long, suberect. Leaves four or five, narrowly oblong, obtusely unequally bilobed, with a mucro in the sinus, flat, thickly coriaceous. Inflorescence lateral, up to 4 cm long, 9- to 12-flowered; floral bracts minute, ovate. Flowers white, sepals and petals tinged pale purple dorsally, spur white tinged pale purple. Dorsal sepal and petals free. Lateral sepals adnate to base of column foot. Labellum spurred, trilobed, the basal margins rigidly attached to lower part of column foot, side lobes almost as long as midlobe, subtriangular to semi-orbicular, obtuse, midlobe broadly ovate, with a saddle-shaped basal callus; spur subconical-cylindrical, thin-walled, ecallose. Column with a pendent foot; pollinarium cruciform, pollinia two, unequally and deeply split, caudicle distinct, stipe narrowly linear, viscidium broadly oblong-ovate.
