Chromosome numbers in the genus Erianthus.
Chromosome numbers determined by the authors for 47 collections of Erianthus are listed. The numbers for 37 are new records, while those for the remaining 10 collections serve as confirmations of previous counts. As indicated by the numbers found by the authors and other investigators, the genus consists of a polyploid series, 2n numbers ranging from 20 in E. fulvus, E. elephantinus and E. ravennae to 100 in E. maximus. Forms with the lower chromosome numbers occur chiefly in the Indian subcontinent, especially in the Himalayan region, whereas the higher polyploids have been obtained from Fiji, Java and neighbouring islands. Aneuploidy is exceedingly rare. Types with 2n = 30, 40 and 60 have been discovered in E. munja, but the differences in chromosome number are not related to morphological disparities. Representatives of E. arundinaceus have 2n = 30, 40, 50 and 60, the occurrence of 2n = 50 in this species being reported for the first time.