Plants 50--120 m tall. Leaves sessile; ligule 2-cleft, 1.5--3 cm; leaf blade lanceolate, 40--60 × 7--12 cm, glabrous except shortly hispid at margin, base cuneate, apex acuminate. Spikes subovoid, ca. 4 cm, 15--20-flowered; peduncle 2--4.5 cm; bracts purple, oblong to linear, 3.3--4 cm × 5--7 mm, margin and apex ciliate; bracteoles absent. Calyx purple, 2.5--3 cm, slightly split on 1 side, pubescent abaxially, apex 3-toothed. Corolla white; tube slightly shorter than calyx, distally sparsely pubescent; lobes oblong, ca. 2.4 cm × 8 mm. Lateral staminodes ca. 1 mm, fleshy. Labellum white with orange midvein, obovate, ca. 3 × 1.5--2 cm, pubescent toward throat, base adnate to filament forming a tube 2--4 mm. Stamen ca. 1.4 cm; anther ca. 1.2 cm; connective appendage entire, ca. 4 mm. Ovary 9-angled, densely pubescent. Capsule purplish, ovoid-globose, ca. 3 × 2.5--2.7 cm, glabrescent, with 9 sparsely toothed wings, apex with persistent calyx; pedicel 1--1.5 cm, Fl. May, fr. Aug--Sep.
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