Abstract
True F1 hybrid between diploid O. punctata and Ceylonese officinaJis (CC) was first produ-ced by the authors. The F1 hybrids within diploid O. punctata showed complete pairing in chromosomes at MI, while those between diploid O. punctata and the others (intermediate form, O. eichin-geri and Ceylonese officinalis) showed low pair-ing in mean at MI, various irregularities and complete sterility of seed. Based on the present results and other evi-dences, the authors again Propose that the genome of diploid O.punctata should be des-ignated as BB.
