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Amaranthus L. is represented by 12 species in the flora of Bulgaria. Most of them are ruderal plants, widely distributed in the country. The representatives of amaranth in the Bulgarian flora are insufficiently studied. The aim of the present study is to study the morphological and karyological variability of one of the most widely distributed annual representatives of the genus in the country - Amaranthus albus L. A diploid chromosome number 2n = 2x = 32 was established. The total length of the haploid chromosome number in the studied populations varied from 14.57 µm to 27.39 µm. The pollen morphology and the seed morphology were examined using a scanning electron microscope (SEM).