Description:—Plant 30-40 cm. high. Tuber 5 cm. long, 2·5 cm. in diameter, ellipsoid, with thick cylindric roots arising from the junction of the stem and tuber. Stem covered with many amplexicaul leaves which pass gradually into the bracts. Leaves 4·5-8 cm. long, up to 3 cm. wide, ovate to ovate-lanceolate, stem-clasping at the base, obtuse or subapiculate at the apex, keeled with the midrib and 2 lateral veins prominent or distinct, glabrous. Inflorescence many-flowered, up to 13 cm. long. Bracts similar to the leaves but smaller. Dorsal sepal 1 cm. long, 9 mm. broad,[{44}] ovate, deeply concave, faintly 3-nerved; lateral sepals 1·3 cm. long, 4·5 mm. broad, oblong, unequal sided, slightly cucullate at the apex, faintly 3-nerved. Petals 1·4-1·5 cm. long, 1 cm. broad, unequal sided, revolute on one margin near the apex, faintly 5-nerved. Lip 2 cm. long, with revolute margins and with two lateral filiform appendages at the base. Spur 3·5 cm. long, cylindric, clavate at the apex. Rostellum triangular in outline, the two side lobes notched. Pollinia sacs behind the rostellum. Stigmas separate, oblong, with small papillae at the junction of the stigma and pollinium sac. Ovary deeply grooved and angled (National Herb. 2730).
Plate 130.—Fig. 1, median longitudinal section of flower; Fig. 2, front of flower, showing lip and column; Fig. 3, sepals; Fig. 4, a petal; Fig. 5, ovary; Fig. 6, pollinium.
F.P.S.A., 1924.
