Erect, slender, terrestrial herbs up to about 12 dm. tall. Leaves 3-13 cm. long and 1.5-4 cm. broad,-elliptic-oblong to lanceolate to ovate-lanceolate, acute or acuminate, margins chartaceous, reduced to bracts upward. Inflorescence a dense-ly flowered raceme up to about 20 cm. long; flowers white. Dorsal sepal 5-8 mm. long and 4-5.5 mm. broad, ovate or suborbicular-ovate, obtuse, cucullate. Lateral sepals 4-8 mm. long and 3-4 mm. broad, ovate, oblique, obtuse. Petals 5-8 mm. long, bipartite, the lobes subequal; anterior lobe filiform; posterior lobe elliptic or elliptic-oblong, obtuse or acutish. Lip about 7-10 mm. long, trilobate; lateral lobes filiform, spreading; mid-lobe linear-ligulate; spur 15-25 mm. long, pendu-lous, slender. Ovary somewhat winged.
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