Roots usually 1 per node, aerial portions 1–2 mm diam. Stems occasionally branched, leafy, very slender, 2–3 mm diam., smooth. Leaves persistent; blade flat, elliptic to broadly ovate, longer than internodes, to 25 × 12 cm, leathery, apex acuminate; distal leaves smaller, proportionately narrower. Inflorescences axillary, several-flowered racemes, short-pedunculate, to 17 cm excluding peduncle; floral bracts foliaceous, ovate-elliptic, to 2.5 × 1.5 cm. Flowers: sepals and petals spreading, green, thick, rigid; sepals oblong-lanceolate to lanceolate-elliptic, to 6.5 × 2 cm, margins undulate, apex reflexed, acute; petals similar, abaxially keeled, slightly smaller; lip basally adnate to column for 5 mm, white with yellow crest, cuneate, to 5 × 3 cm when spread, distally 3-lobed, lateral lobes arching over column, rounded, margins involute, middle lobe broadly 3-angular, margins undulate, apex obtuse to rounded; disc with thick longitudinal crest, becoming 3-keeled toward apex, 5 mm wide, glabrous; column white, slender, 20–25 mm; pollinia yellow; pedicellate ovary to 5 cm. Berries cylindric, slender, to 27 cm.
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