Pseudobulbs tufted, cylindric, usually 10-25 × 1-2 cm, 2-4-noded, apex 4-or 5-leaved. Leaves shortly petiolate, narrowly elliptic, 12-16 × 3.5-4.5 cm, apex obtuse. Inflorescence subterminal, ca. 15 cm, glabrous, densely many flowered; floral bracts yellow, narrowly elliptic, ca. 8 × 3.5 mm, acute. Flowers yellowish white; pedicel and ovary 4.5-6 mm. Dorsal sepal narrowly elliptic, ca. 9.5 × 2.7 mm, acute; lateral sepals obliquely narrowly ovate, ca. 9 × 3 mm, acute. Petals elliptic, ca. 8 × 2.4 mm, acuminate; lip triangular-ovate or rhombic-ovate in outline, ca. 3.5 × 2.3 mm, adaxially with 2 dark red keels running to near apex, strongly contracted at base, articulate with column foot, margin entire, apex acute. Column ca. 1.8 mm; foot very short. Fl. Jul. 2n = 36, 38, 40, 44.
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