BEGONIA MATILLANOAE (BEGONIACEAE), A NEW SPECIES FROM MALAMPAYA SOUND PROTECTED LANDSCAPE AND SEASCAPE, PALAWAN ISLAND, PHILIPPINES

A new species, Begonia matillanoae, is here described and illustrated from Malampaya Sound Protected Landscape and Seascape, Palawan Island, Philippines. It closely resembles Begonia cabanillasii but is distinct in having an ovate leaf with irregularly lobed margin, an acute leaf apex, and a 5-tepalled pistillate flower with the larger wing flat to shallowly cucullate. Begonia matillanoae is the latest addition to the Palawan begonias bearing a conspicuously 5-winged ovary. Based on IUCN guidelines, we here propose a  Critically Endangered (CR) conservation designation for this species. A revised key to Palawan Begonia sect. Baryandra bearing five or six conspicuous ovary wings is also provided.