Japan Flora: Stems 10-30 cm. long, slender, erect, stiff, glabrous, the lower portion with 3-7 membranous sheaths; leaves 1-4, on the upper part of the stem, thin, firm, ovate-oblong to lanceolate, 5-10 cm. long, 2-3.5 cm. wide, caudate-acuminate, narrowed to the petiole, many-nerved, plicate; uppermost leaf at the base of the peduncle broadly linear, about 4 cm. long, 3-5 mm. wide; spikes about 10-flowered, the peduncle about 6 cm. long, the bracts lanceolate, 1-3 mm. long, acuminate; flowers yellow; dorsal sepal narrowly obovate, 6-8 mm. long, 3-3.5 mm. wide, the lateral sepals completely united into an obovate, navicular blade; petals lanceolate, about 6.5 mm. long, 3 mnx wide; lip ovate-lanceolate, about 5 mm. long, 3.5 mm. wide, saccate at base, abruptly recurved at apex; column about 3 mm. long. July-Aug.

Honshu (Hachijo 1st in lzu), Shikoku (Tosa Prov.), Kyushu (Yakushima and Koshiki); very rare.