Pseudostems ca. 1.8 m, sparsely villous. Leaves sessile; ligule 1--2.5 cm; leaf blade narrowly linear, 10--50 × 1.5--7 cm, adaxially glabrous, abaxially villous, base rounded or cuneate, apex caudate. Spikes cylindric, 20--35 × 15--22 cm; rachis densely villous; bracts long ovate, 4--5 cm, 3-flowered, apex obtuse. Flowers white or yellow. Calyx 3--3.5 cm, abaxially villous, apex 3-toothed. Corolla tube pale purple, 3.5--4.2 cm; lobes pendent, yellow, linear, 4.3--4.7 cm, apex involute. Lateral staminodes white or yellow, pale purple at base, oblanceolate, 2.9--3.3 cm. Labellum white or yellow, pale purple at base, orbicular, 2.2--2.5 cm wide, apex 2-cleft. Filament purple, 5--5.5 cm; anther purple or orange, 1--1.2 cm. Ovary densely sericeous, 2.5--3 cm. Capsule ovoid-globose or ovoid, 1.3--3 × 1--1.7 cm. Seeds red. Fl. Aug.
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