Cyathocalyx is a small genus with about 36 species distributed from southern India, Sri Lanka, through Malaysia, Indomalayan islands and reaches as far as Fiji in the South Pacific.
The salient features of the genus includes- monopodial trees, supra-axillary or nearly leaf-opposed inflorescences, six petals which are basally concave and constricted above the reproductive organs to form a "pollination chamber".
* Cyathocalyx augustipetalus R. J. Wang & R. M. K. Saunders
1. ^ Wang, R.J and Saunders, R.M.K.S (2006) A synopsis of Cyathocalyx species (Annonaceae) in Peninsular Malaysia, Sumatra, and Borneom with descriptions of two new species. Botanical Journal of the Linnaean Society. 152,513-532.
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