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POWO follows these authorities in synonymising this name:
Pridgeon, A.M., Cribb, P.J., Chase, M.C. & Rasmussen, F.N. (2003). Genera Orchidacearum 3: 1-358. Oxford University Press, New York, Oxford. [Cited as Ponthieva.]
Salazar, G.A., Cabrera, L.I., Madriãán, S. & Chase, M.W. (2009). Phylogenetic relationships of Cranichidinae and Prescottiinae (Orchidaceae, Cranichideae) inferred from plastid and nuclear DNA sequences. Annals of Botany 104: 403-416. [Cited as Ponthieva.]
This name was accepted following an alternative taxonomy by these authorities:
Govaerts, R. (2003). World Checklist of Monocotyledons Database in ACCESS: 1-71827. The Board of Trustees of the Royal Botanic Gardens, Kew. [Cited as Exalaria.]
Other Kew resources that provide information on this taxon: