抄録
The haploid chromosome numbers of the following have been determined for the first time:-Capparis zeylanica Linn.=20. Cadaba indica Lamk.=18. Maerua arenaria Hook. f & Thomp.=10.
Secondary association is reported in Capparis zeylanica and the previous finding that the primary basic number of the family 7 is supported by observations made herein.
Evidence is found to show that polyploidy as well as structural changes of chromosomes have played an important part in the evolution of the species. The association of 4 bivalents is interpreted on this basis.
Secondary association and its limitations as the sole factor in determining ancestral homology are discussed in the light of the present findings and of the data gathered previously on other genera of this family.
Some general remarks are made on the distribution of chromosome numbers in this family and a tentative scheme formulated to show the phylogenetic evolution of some of the important genera.
