D. powellii Schlechter Erect or +/- pendent, epiphytic herb; pseudobulbs lacking; stem unbranched, 15-45 cm long, enveloped by conduplicate leaf bases, the terminal portion bearing 6-12 leaves. Leaves distichously imbricating; blades spreading, linear-ligular, acute to acuminate, 6-13 cm long, to 6 mm wide, articulated at base, eventually deciduous. Flowers few, solitary from leaf axils; pedicel with a cucullate bract at apex; sepals and petals subequal, +/- lance-elliptic, pale yellow-green, to 1.3 cm long and 4 mm wide, +/- acute; lip purplish or green marked with purple, the claw at base broad and ligular, the blade somewhat expanded, trilobate, folded into an open-sided tube, the lateral lobes retrorse; column shorter than lip. Capsules glabrous, shiny, smooth, to 1.6 cm long. Shattuck 1012.