In this paper, the chromosome number and karyotype of the small genus, Porandra Hong (Commelinaceae), are reported for the first time. The two species, P. ramose Hong and P. scandens Hong, were found to have the same chromosome number 2n=36 and quite similar karyotypes, which could be formulated as 2n = 36 = 4m=26sm + 6st (2sat).Having the same original basic chromosome number x = 9 and very similar chromosome morphology, Porandra might be closely related to Amischotolype and Coleotrype, as indicated