Cynorkis Section Gibbosorchis H. Perr.
Description:
Rostellum entire with one part longer in front of the anther, divided and 3 lobed (2 arms and a median lobe), median lobe not inferior, supplementary; the arms to at least l mm long; median lobe obscurely ascending in front base of the lateral sepals and petals free or more or less joined basally; flowers generally large and brilliant, Labellum often 4 lobed (trilobed with the median lobe bifid).
Type species:
Cynorkis gibbosa Ridl.
Section represented in Madagascar by 16 species of which 14 are endemic and 2 (C. purpurascens and C. fastigiata) are special to the Malagash region.
Keys to the groups:
| 1 | Labellum entire, trilobed or with 5 lobes, the inferior lobes reduced, in the last case, to 2 obtuse teeth | Group 1 |
| 1a | Labellum with 4 lobes or trilobed with the median lobe bifid or bilobed | Group 2 |
New species and nomenclatural changes in Cynorkis (Orchidaceae: Orchidoideae) from Madagascar and the Mascarenes, Kew Bulletin volume 72, Article number: 38 (2017)
Species:
| Cynorkis aconitiflora Hermans, Andriant. & Sieder | Madagascar |
| Cynorkis christae Hermans, Andriant. & Sieder | NW. Madagascar |
| Cynorkis elephantina Hermans, Andriant. & Sieder | Madagascar |
| Cynorkis mammuthus Hermans & P.J.Cribb | N. Madagascar |
| Cynorkis mangabensis Hermans & P.J.Cribb | Madagascar |
| Cynorkis sanguinolenta Hermans, L.Gaut. & P.J.Cribb | Madagascar |
| Cynorkis siederi Hermans & Andriant | Madagascar |
| Cynorkis syringescens Hermans & P.J.Cribb | Madagascar |
World Checklist of Monocotyledons. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the Internet; http://www.kew.org/wcsp/monocots/ accessed 03/04/2020
