Meiotic studies and taxonomic considerations in some taxa of Verbenaceae.

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Abstract
Meiotic pairing in 6 spp. of the genus Clerodendrum L. [C. thomsonae, C. speciosum, C. infortunatum, C. phlomidis, C. siphonanthus, C. inerme] revealed lower frequencies of rod bivalents than ring bivalents. All most equal frequencies of rod and ring bivalents per nucleus in H. sanguinea Retz. and L. camara Linn. were observed. In P. volubilis Jacq. Queens Wreath; rod and ring bivalents frequencies are 6.4 and 10.8, respectively. Not more than 2 chiasmata per bivalent were recorded in any of the taxa investigated. Higher chiasma frequencies were seen in all the 6 species of Clerodendrum investigated than that of H. sanguinea, L. camara and P. volubilis. The meiotic behavior of chromosomes stressed that each species has come to possess its own genotypic behavior and cytological performance. No cytological configurations to indicate the hybrid nature of C. speciosum were detected. However, cryptic structural hybridity might have led to the formation of abortive pollen grains and seeds in C. speciosum.

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