Sterile stem 150-400 mm long. Spike mostly 4-to 10-flowered. Flowers with perianth tube 28-40 mm long, slender lower part 15-20 mm long and upper wider part 12-15 mm long; dorsal tepal 25-45(-50) mm long, upper lateral and lower median tepals narrowly lanceolate, 20-25 mm long, attenuate and mucronate, lower lateral tepals clawed with ovate blade. Filaments 37-70 mm long, exceeding apex of dorsal tepal; anthers 5.0-7.5 mm long. Style dividing opposite middle of anthers or shortly beyond them, branches 4-5 mm long.
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