1	Flower ca. 7 mm; petals are flat with slightly cucullate base; leaflets are thickly leathery	E. reticulatum C. Y. Wu ex S. Y. Bao
–	Flower ca. 10 mm; petals are flat; leaflets are membranaceous.
2	Rhizome compact, diameter 4–6 mm; inflorescence panicle	E. campanulatum Ogisu
–	Rhizome long creeping, diameter 1–3 mm; inflorescence raceme.
3	Inflorescence usually 7–14-Flowered, two alternate or opposite trifoliolate leaves	E. ecalcaratum G. Y. Zhong
–	Inflorescence usually 2–6-Flowered, one trifoliolate leaf, sometimes two opposite trifoliolate leaves	E. platypetalum K. Meyer