Abstract
Cytological studies were made in Oplismenus burmannii (n=9, 8 and 2n=45), O. compositus (n=9, 27, 36) and O. undulatifolius (n=27, 27+2 B's). Pentaploid taxon (2n=45) in O. burmannii and diploid taxon (n=9) in O. compositus are new records. Pentaploid of O. burmannii was found to be an asynaptic taxon and has been discussed as a hybrid between O. burmannii (n=18) and O. compositus (n=27).
