Cytological Studies in Scrophularia: Presence of B-Chromosomes

抄録

Cytological studies have been made in two West-Himalayan species of Scrophularia for the first time. A new base number x=12 is suggested for the genus and hence S. himalensis (n=24) and S. polyantha (n=12) are tetraploid and diploid species. The presence of B-chromosomes has been observed in both species and their significance in the origin of new base number is described.