Climbing and trailing liane up to 8 m long; roots adventitious, arising at the nodes, aerial or clinging to substrate, rooting in soil where they touch the ground.Stem succulent, channelled, bright green, 10–12 mm in diameter; internodes 12–15 mm long.Leaves up to 24 × 6.5 cm, fleshy, lanceolate, oblanceolate or ovate, acute.Inflorescence axillary or pseudo-terminal, up to 20-flowered, with 1–3 flowers open at a time.Flowers white or greenish-white, lip yellow towards the base, usually purple at the apex, or pure white.Ovary and pedicel 5.5–6 cm long.Sepals 3.6–6 × 0.5–2 cm, oblanceolate, fleshy; petals similar, but slightly broader and less fleshy with a keel on the outer surface, terminating in a projecting point c. 2 mm long.Lip 4.5–6 cm long, 2.5 cm wide, obscurely 3-lobed, funnel-shaped, adnate to column at base, undulate on the margin; disk (below apex of column) with crest of up to 12 rows of transverse, parallel, branched scales up to 2 mm long; basal 3 cm of lip with papillae.Column 3–4.5 cm long, the basal 2–3 cm adnate to lip.Capsule up to 15 × 1.5 cm.
