Abstract
1. Chromosome number of Thelepogon elegans, a monotypic genus, has been found to be 2n=10. This is the first record of chromosome number in this monotypic genus. It forms five bivalents at metaphase I. The grass is diploid. Pollen viability is 98%.
2. In few P.M.Cs ten bivalents instead of five have been observed at diakinesis and metaphase I. This is a case of syndiploidy.
3. In one plant of this grass, spontaneously occurring associations of chain of four, six or an open ring of eight chromosomes have been observed showing interchange heterozygosity. Pollen viability is 97%.
