ornamented with 3 longitudinal ridges that are thin at first then lobed， with scattered papillae usually forming a round， present at flowering; perianth yellowish-green; epichile ornamented from the base with three prominent longitudinal nerves continuing as filiform papillae on the median lobe， lateral lobes auriculate in shape ………………………………………………... 26. E. livingstoniana 24. Labellum convex; epichile ornamented with 3–5 ribs and lateral lobes not auriculate ………..………… 25 25. Sepals 10–12 mm long and 2.5–3 mm wide; petals 10–12 mm long; epichile 15–20 mm long， pedicel about 3 mm long; sepals curved， ornamented with 4–5 thickened ridges toward the apex …….… 31. E. latilabris 8. Epichile clearly to deeply trilobed， about 2 mm long; epichile with ridges gradually disappearing toward the apex …………….… 12. E. tuberculata 21. Leaves gradually attenuated into a petiole …………………………………………………………...…… 22 21. Leaves not attenuated into a petiole ………………………………………………………………….…… 23 22. Perianth bicolored; sepals greenish and marked with brown; petals dark yellow; labellum dark yellow， sometimes subglobular at the apex ………………….…… 46
