Morphological variations in populations of Urginea indica Kunth.Liliaceae.

An attempt has been made to enquire into the morphological variations which leads to evolutionary divergence of populations of Urginea indica Kunth. In particular, there were considerable morphological variations within the species. The thirty two cytotypes showed distinct morphological differences in shape, size and colour of bulb and leaf, the length of inflorescence and flower colour. The morphological complexity is accompanied by high degree of cytological variations. Preliminary measurements of reproductive, characters have shown that no noteworthy results may be obtained in this characters except pedicel length but the vegetative character deviated significantly. Flowering and blooming time varied that also played a role in isolation of these populations. These morphological differences have a genetic basis and would be worthy in recognizing them as a separate sub specific taxon

Cytomorphological Study in Three Species of the Genus Chlorophytum Ker Gawl. (Liliaceae)

A detailed Karyotypic and meiotic study in three species of Chlorophytum is presented and its significance is discussed in the light of the modern concepts. Chlorophytum elatum R. Br. is tetraploid with 2n=28 chromosomes, C. heynei Baker. and C. laxum Baker. are diploids with 2n=14 or 16 chromosomes, in x=7 and 8 basic number lines and C. elatum shows asymmetrical karyotype while C. heynei and C. laxum show symmetrical karyotypes. Karyomorphological studies reveal some minor differences between the three species, such as absolute chromosomal length and relative length which clearly indicate a common origin and close relationship of these three species. However, populations of Chlorophytum elatum, C. heynei and C. laxum vary slightly in their intraspecific cytomorphological characteristics which may be the basis of ecotypic differentiation. The behaviour of chromosomes during meiosis in all the 3 species is found to be fairly normal. Nevertheless, in C. elatum quadrivalent association of chromosomes, laggards and bridges are of common occurrence. The presence of B-chromosome in C. elatum is recorded for the first time

Sympatric Origins Of R-pomonella

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/62719/1/339346b0.pd