Bulbous perennial up to 60cm. Leaves 2-3, slender, channelled, conspicuously clasping the stem in the lower part and warty towards the base. Bears a raceme of nodding fragrant flowers, yellow with green keels, 15-25mm long, inner petals have a hinged flap at tip; outer stamens sterile.

After: Thomas Cooper (1815-1913), English botanist and plant explorer, collected plants mostly in the Drakensberg Mountains.