Key to genus Sphyrarhynchus Mansf.

1a Flowers white, lip with a green blotch  Sphyrarhynchus schliebenii
1b Flowers cream to pale green, lip uniformly coloured  2
2a Spur filiform, 7–13 mm long  Sphyrarhynchus amaniense
2b Spur clavate, 4–5 mm long Sphyrarhynchus brevilobus

World Checklist of Selected Plant Families.. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; accessed 28/02/2020