Revision of the genus Cleistanthus (Euphorbiaceae) in the Philippines

The Philippine species of the euphorbiaceous genus Cleistanthus are revised. Sixteen species are recognised for this archipelago of which two are recorded from there for the first time. The oldest available combination from the Philippines [C. orgyalis (Blanco) Merr.] remains obscure and three collections from Palawan are tentatively treated as a separate taxon (C. spec. A). Three species are illustrated here and distribution maps for the Philippines are given for all species.