Martin Cheek is a botanist in the Wet Tropics of Africa Team, based at the Herbarium, Royal Botanic Gardens, Kew. Iain Darbyshire works in the department of accelerated taxonomy at the Royal Botanic Gardens, Kew, specializing in Acanthaceae systematics and African plant diversity and conservation. Jean-Michel Onana is a botanist based at the IRAD-National Herbarium of Cameroon.