Rhizome: sections between pseudobulbs 1.5-2.5 cm. Pseudobulbs close, depressed conic, 1.5-2.5 × 1.5-3 cm. Petiole 1-1.5 cm; leaf blade ?elliptic, 7-9.2 × ca. 1.8 cm, ?subacute. Inflorescence an elongate, rather lax raceme, erect to spreading, 28-54 cm, 23-33-flowered; peduncle 14-25 cm; rachis not thickened, 14-22 cm, glabrous; floral bracts triangular, 3-4 × ca. 2 mm, acute. Flowers spreading to reflexed, secund, not fully opening, many simultaneously, blackish purple, yellowish toward base, or yellowish with blackish purple veins, margins, and scattered spots, lip blackish purple with green or yellowish ridges adaxially. Pedicel and ovary 5.5-9 mm. Dorsal sepal porrect to recurved, ovate, 4.5-7.5 × 2-4.2 mm, rather thin, abaxially glabrous, adaxially pubescent, base rather broadly attached, margin ciliate, apex acute; lateral sepals recurved, elliptic to ovate, 6-8 × 2.5-4.2 mm, acute to acuminate, otherwise as dorsal sepal. Petals ± porrect, spatulate, 2-2.5 × 0.8-1.5 mm, surface pubescent distally, base broadly attached; rather thick with a thick top, margins ciliate distally, apex acute to acuminate; lip recurved in proximal half, pouch-shaped distally, obovate in outline, 4.8-5.5 × 1.8-3.2 mm, rather thin; abaxially with a wide, rounded ridge near base, surface otherwise convex, pubescent, or only so in front of basal ridge and toward margins; adaxially somewhat concave and with a median slit reaching up to ca. 1/3 of lip near base, with 2 distinct, obtuse ridges diverging proximally, running ± parallel over ca. 3/4 of lip, and ending in some irregularly shaped calli, surface with irregular, radiating furrows distally but otherwise glabrous, margins ciliate, apex rounded. Column 1-1.6 mm; stelidia triangular, 0.4-0.7 mm, acute. Fl. Mar-May, Jul.
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