Leaves 3—5(-8), narrowly oblongelliptic, 10-25 cm long, 3-5 cm wide, adaxially tessellated with dark green and pale yellow-green, abaxially pale green. 

Scape 15-25 cm long, purple-brown, shortly white-hairy; bract ovate-lanceolate, 1.5-2.5 cm long, green, shortly hairy; pedicel and ovary 3.5--6cm long, green, shortly ha吓flowersingle, 11-15 cm across; dorsal sepal and synsepal white, veined with green; petals green, heavily covered with maroon wart-like spots; lip maroon or red-brown in upper part, greenyellow and veined with maroon in lower part; staminode pale yellow-green, with green veins; dorsal sepal broadly ovate, 3.2一5.4cm long, 2.5-44 cm wide; synsepal subelliptic, smaller than dorsal sepal; petals narrowly oblong or oblong-oblanceolate, 5.4-7.3 cm long, 1.5-2.4 cm wide, ciliate; lip helmet-shaped, warted on its incurved side-lobes; pouch subovoid, 3-4cm long, 2.3一3.2cm wide; stamioode somewhat horseshoe-shaped, 8-12 mm long and wide, puberulous adaxially. 

Flowering period: January to April in the wild.