Mitrephora chulabhorniana (Annonaceae), an extraordinary new species from southern Thailand

Abstract

© 2019, The New York Botanical Garden. Mitrephora chulabhorniana, a remarkable new species with the smallest flowers in the genus, is described and illustrated. The new species, from a karst habitat of southern Thailand, morphologically most resembles M. andamanica, which is endemic to the Middle and North Andaman Islands, but differs primarily by having narrower leaves, shorter inner petals, and lower number of stamens and carpels per flower. The conservation status of M. chulabhorniana is assessed and a key to the species of Mitrephora in Thailand is given.