Ceratolobus

thumb|Calamus glaucescens, formerly Ceratolobus glaucescens

Ceratolobus was a dioecious genus of flowering plants in the palm family found in Southeast Asia, commonly called rotan. Its species are now included within the genus Calamus. They were only differentiated from Calamus and close relatives like Korthalsia by leaf sheath appendages or inflorescence variations. The Greek genus name combines "horn" and "capsule".