ABSTRACT:

Genus Arisaema Mart. comprises ca. 170 species in the world. In India, it is represented by about 43 species. Arisaema sahyadricum S. R. Yadav, K. S. Patil & Bachulkar consists of one variety, viz. A. sahyadricum var. ghaticum Sardesai, S.P.Gaikwad & S.R. Yadav under the section Tortuosa, so far known from Maharashtra state. The present paper describes mitotic counts and karyotype analysis of the species and its variety. A. sahyadricum var. sahyadricum and A. sahyadricum var. ghaticum both showed 2n 5 28. The karyotype exhibited 1b category of Stebbins asymmetry classes. These two taxa also showed difference in their karyotypic formulae. Arisaema sahyadricum var. sahyadricum displayed 8sm + 22m chromosomes while A. sahyadricum var. ghaticum showed 2sm + 26m chromosomes.