A key to the species of Hederorkis

1 Leaves 4-6 x 1.3-2.5 cm, sepals 6-8 mm long, lip 5-6 x 2.5 mm, distinctly 3-lobed, ecallose  Hederorkis scandederis
1a Leaves 12-19 x 4.5-6.5 cm, sepals 10-12 mm long, lip 8-10 x 3 mm, obscurely 3-lobed, with two fleshy keels Hederorkis seychellensis

World Checklist of Monocotyledons. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; accessed 20/07/2019