Costus whiskeycola Maas & H.Maas A cultivated plant grown from seeds from the Plowman & Davis 4396 accession now growing at the Utrecht Botanical Gardens, The Netherlands B cultivated plant obtained from the established nursery trade, accession D.Skinner R2847 C flowers showing spreading labellum with lateral markings and a prominent honey mark D bracts with green and red erect appendages E comparison of leaf plication between (i) C. whiskeycola and (ii) C. erythrophyllus F comparison of ligule and leaf bases of (i) C. whiskeycola and (ii) C. erythrophyllus G comparison of leaf sections showing thicker mesophil layer in (i) C. whiskeycola v. (ii) C. erythrophyllus. Leaf images in C–D taken from plants that were pressed and accessioned as D.Skinner R3026 (C. whiskeycola sp. nov.) and D.Skinner R2948 (C. erythrophyllus). Photo A by Lubbert Westra, photos B–F by Dave Skinner.