Studies on South Indian Compositae: Cytology of the Genus <i>Blumea</i> DC

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Cytology of seven species of Blumea indigenous to S. India, viz. B. wightiana (n=9 and 2n=18), B. barbata (n=8 and 2n=16), B. lacera (n=18 and 2n=36), B. virens (n=9 and 2n=18), B. jacquemontii (n=9 and 2n=18), B. oxyodonta (n=9) and B. membrancea (n=18) has been studied, of which three are fresh reports and the others are new counts.<br>Four haploid basic chromosome numbers are known in Blumea (x=8, 9, 10 and 11), of which x=8 is reported for the first time in the genus. The S. Indian taxa fall into two basic series, x=8 and 9. Cytological evidence indicates that x=10 in Blumea could be the earlier evolved condition, from which the lower constitutions found among the S. Indian taxa have evolved by progressive reduction through formation of B's followed by their elimination.<br>Four species of Blumea reported here showed frequent occurrence of accessory chromosomes in the PMC's at meiosis, and they showed a tendency for meiotic elimination. This is the first report of B's in the genus.

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