Click the number at the start of a key lead to highlight both that lead and its corresponding lead. Click again to show only the two highlighted leads. Click a third time to return to the full key with the selected leads still highlighted.
1 Lateral petals spreading, not typically embracing (covering) column at anthesis; lateral petals undulate
..2 Flowers typically purple, occasionally pink; outer-most crests (lamellae) extending to the midlobe of labellum; lateral lobes of labellum not conspicuously veined
..2 Flowers typically pink, occasionally rose-purple or deep purple; all crests (lamellae) extending onto the midlobe of labellum; lateral lobes of labellum conspicuously veined