Karyotypic studies in the genus Crotalaria Linn.

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Abstract
Karyotypic analyses were made using root tip mitoses in 29 collections representing 27 spp. of the genus Crotalaria (Leguminosae). Karyotype asymmetry was of a low order. If C. incana with 2n = 14 is derived from the taxa having 2n = 16, a secondary trend from asymmetric to symmetric karyotype will have to be presumed. Since karyotypic differences could be found within a species, minor differences in karyotype should not be considered to have a strong bearing on taxonomy without giving due consideration to morphological differences. Evolution in the genus must have taken place due to changes in individual genes or gene complexes due to mutations or gene recombinations. Structural changes in chromosomes, if any did not change the karyotypes in any significant manner.