Cytological investigations on central Indian Compositae.

Fifty eight species of the Compositae from Central India, which so far remained cytologically unexplored, have been worked out with new chromosome counts for the species of Eupatorium conyzoides (2n=40), Conyza leucantha (n=9), C. stricta (n=18), Blumea fistulosa (2n=30), B. lanceolaria (n=10), Helichrysum bracteatum (n=13), Laggera falcata (n=20), Wedelia urticaefolia (2n=72), Seneclo grahami (n=10), S. saxatilis (n=10), Goniocaulon glabrum (n=16), Tricholepis glaberrima (n=16) and T. radicans (n=16). Eupatorium conyzoides (4x), Blumea fzstulosa (3x) and Wedelia urticaefolia (4x) are the polyploid species in which meiosis is characterised by the presence of some multivalents. The frequency of polyploidy in the Central Indian Compositae is 20.3%, which is almost same in the annuals (21.1%) and perennials (20.0%).