Please google "IPCN Chromosome Reports" or visit http://www.tropicos.org/Project/IPCN/. At the latter website, you can search under an option at the left side of the page. Chromosome numbers are given for M. depressa (2n = 26), M. pustulata (2n = 22), and M. echinata (2n = 18), all from Kew Bull. 52(1): 121-138. It is not obvious from these numbers that hybridization is or is not occurring. Charles Crane ccrane@purdue.edu