Abstract

In this study, the morphological and karyological characteristics of Euphorbia smirnovii Geltman, which is naturally distributed in Eastern Black Sea and Eastern Anatolia Regions, have been examined. The morphological description of the species is given in detail and supported by photographs. In addition, leaf, capsula and seed surface micromorphology have been investigated with SEM. Karyological investigation carried out by the standard Feulgen technique and squashes were prepared. The chromosome number, karyotype formula, ideogram, chromosome measurement values were reported for the first time in this study. It has been found that the species is also spreading in Armenia and it is clear that the species is not endemic. Euphorbia smirnovii, capsules, lower and upper surface of the leaf are covered with papilla. According to the results, the species was tetraploid with 2n=4x=36 chromosomes. The karyotype formula is 32m+4sm. The smallest chromosome length is 0.79μm and the largest chromosome length is 1.52μm. Haploid total chromosome length is 10.30μm and mean chromosome length is 1.14μm.