抄録
Twenty six somatic chromosomes were analysed morphologically. From prometaphase to metaphase, trabants have been frequently observed in two paired chromosomes but unfortunately such figures do not always exhibit to the best advantage.
In B. Evansiana, meiotic chromosomes were first demonstrated by the present study. The secondary association of meiotic chromosome has also been described. The following various types of secondary association were ascertained. (i) 6(2)+1(1), (ii) 5(2)+3(1), (iii) 4(2)+5(1), (iv) 3(2)+7(1), (v) 2(2)+9(1), (vi) 1(2)+11(1) and (vii) 13(1). Six groups of two bivalents and one bivalent was the maximum type.
B. Evansiana may be a secondary balanced allopolyploid based on n=6 and 7 which is the primary basic number.
