Flowering plant 17–42 cm tall, slender to stout. Leaf erect, linear-lanceolate, to 22 cm long, shorter than raceme, rigid, fleshy, triangular in cross-section, channelled. Stem bracts 2, copper-coloured. Flowers 3–12, pale green with darker stipes and purplish labellum hairs; subtending bract lanceolate, tapering to fine point, shorter than flower; pedicel (excluding ovary) 5–13 mm long; dorsal sepal erect, ovate, 8–12 mm long, concave, acute; lateral sepals ovate, as long or slightly longer than dorsal sepal but narrower, spreading below labellum; petals spreading, ovate-lanceolate, shorter and much narrower than dorsal sepal, yellow with darker stripes. Labellum curved, with fleshy rectangular base and wide triangular lamina, 9–14 mm long; margins fringed with reddish-blue hairs with metallic lustre; basal portion covered by 2 smooth, longitudinal, metallic-blue plates; central portion moderately covered with bristly purple hairs; tip recurved, ending in short glabrous strap-like tail. Column short, widely winged, with 2 purple, eye-like glands at base, not connected by a ridge but generally with reddish-brown markings between them. Flowers Oct.–Nov.