Japan Flora: Pseudobulbs narrowly ovoid-conical, angled, 3-5 cm. long; leaves 3-5 on the pseudobulb, narrowly oblong to broadly oblanceolate, 20-40 cm. long, 5-8 cm. wide, acuminate at both ends, plicate, the petioles 20-30 cm. long; scapes 40-60 cm. long, erect, rather stout, with few membra-nous, sheathing scales; racemes 15-25 cm. long, 5- to 18-flow- ered, the bracts membranous, oblong, subacute, nerved, 15-20 mm. long; flowers yellow, becoming indigo-blue when dry; sepals and petals narrowly oblong, 3-^.5 cm. long, 1-1.5 cm. wide, obtuse, nerved, obliquely spreading; lip cuneate-obovate, slightly shorter than the other perianth lobes, loosely embracing the column in natural position, 3-lobed, with strongly papillose, crispate-dentate margins near tip, the lateral lobes semirounded, the terminal lobe broader and denticulate; spur 7-8 mm. long, lanceolate; column about 2 cm. long, long- pubescent on the inner surface; capsules pedicelled, pendulous, narrowly oblong, 3-4 cm. long. June.

Honshu (Izu- Shichito Isis, and Kii Prov.), Shikoku, Kyushu; rather rare.

f. punctatus Ohwi. Leaves white-maculate. Occurs with the typical phase.