Ceratandra atrata T.Durand & Schinz

Plants erect, to 350 mm; leaves ciliate, numerous, cauline ones narrowly linear, acute, to 60 x 4 mm. Inflorescences somewhat lax, to 170 mm long; bracts acute, ciliate, 13-20 x 2-3 mm. Flowers numerous, c. 20 x 15 mm, greenish-yellow, non-resupinate; ovary c. 14 mm long. Median sepal narrowly lanceolate to elliptic, acute, c. 12 x 3-4 mm, adnate to the petals; lateral sepals erect, oblique, obtuse, 11-12 x 5-6 mm. Petals deltate-spathulate, acute, shallowly concave, c. 12-13 x 5 mm. Lip erect, anchor-shaped; limb 4 x 2 mm; blade 9 mm across, c. 2 mm wide, subacute, lateral extremities obtuse, usually with fleshy callus, c. 2 x 1 x 1 mm. Stigma lobes elliptic, pulvinate, at the rostellum in its lower part; rostellum arms 7-8 mm long, horn-like projecting.