Cytotaxonomy Of Lychnophora Mart. (asteraceae: Vernonieae: Lychnophorinae) Species

Most species of the genus Lychnophora Mart, are endemic to the Brazilian "campos rupestres" of Minas Gerais, Bahia and Goiás, with high degree of endemism in many species. There is disagreement between different authors regarding delimitation of the species and, consequently, the amount of species (from 11 to 68), This interpretation difference leads to sinonimization and the transference of several species to closely related genera. The cytotaxonomic study of species of Lychnophora was made aiming at increase of knowledge of chromosome characteristics that could be useful to the understanding of the taxonomy of the group as a whole. Chromosome numbers of about eighteen species were determined, with 2n=34, 36 or 38. These chromosome numbers were distributed among species of four sections of Lychnophora, so they can't be used as distinctive characters for intergeneric and infrageneric levels below section level. However, chromosome numbers were very important for the differentiation of some species of Lychnophora, whose taxonomie limits have been questioned. Other karyotype characters were analysed in three species of the subtribe, like chromosome size and morphology, showing constancy of these characters. The chromosomes are small, with 1.0 to 2.58μm, and they are mainly metacentric, however some submetacentrics were observed.6001/02/152128CARR G.D., KING R.M., POWELL A.M. and ROBINSON H., 1999 -Chromosome numbers in Compositae, XVIII. 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