Habenaria marginata Colebr.

Plants 10-25 cm tall with turnip-shaped tuberoids. Stem with 3-5 closely crowded sub-basal leaves, above with 2-4 small leaf-like sheaths. Leaves sessile, spreading, and ovate to oblong, acute, with pale yellow margins. Inflorescence broadly cylindrical, up to 10(-15) x 5 cm. Bracts lanceolate, ± equalling in length the ovary. Flowers green and yellow. Sepals green; dorsal broadly ovate 7-8 x 7 mm, forming a hood with the petals; lateral sepals narrower, oblong-lanceolate, 7 x 3.5 mm. Petals greenish, outer half yellow, triangular-ovate, slightly falcate, 9 mm long, 5 mm broad at base. Labellum bright yellow, 3-lobed from a 2-3 mm long undivided basal part; mid-lobe linear, margins reflexed, obtuse 7-8 x 1.5-2 mm, side lobes longer, narrower, 9 mm long, usually terminating in an ± involute filiform apex. Spur equalling ovary in length, about 12 mm long, widened at base, with slightly inflated and laterally compressed apex. Anther canals c. l mm, stigmatic processes c. 1.5 mm long.