Abstract
Eleven new species of Begonia (Begonia alabensis, B. bintang, B. bosuangiana, B. crockerensis B. doloisii, B. flammea, B. inobongensis, B. kinahimiae, B. kipandiensis, B. rambutan and B. tomaniensis) are described from the Crocker Range, Sabah. Nine species belong to sect. Petermannia and one, B. doloisii, belongs to sect. Baryandra while the section for B. tomaniensis is uncertain. All the species grow within the Crocker Range areas either within or outside the park boundary.