Costus antioquiensis Maas & H.Maas A inflorescence terminating a leafy shoot B ligule showing indument at margin C inflorescence close up with flower at anthesis D bract (adaxial surface) subtending a bracteole (left), calyx with three lobes, and ovary at the base of the calyx E labellum as viewed from front, with the forked tip of the single fertile stamen visible at the center F stamen (left) and style (right) G stigma close-up, dorsal (left) and ventral (right) views. The forked projection on the ventral surface hooks between the thecae of the fertile stamen to hold the style erect. Drawing by Esmée Winkel.