In the series Rupestria Berger the following chromosome numbers were found: Sedum forsterianum Sm., 2n = 48 and 96; Sedum montanum Song. & Perr., 2n = 34 and 51; Sedum ochroleucum Chaix in Vill., 2n = 34 and 68; Sedum reflexum L., 2n = 85, 102, and 153; Sedum sediforme (Jacq.) Pau, 2n = 32, 64, and 96; Sedum tenuifolium (Sibth. & Sm.) Strobl, 2n = 24 and 72. The author is of the opinion that for the present all these taxa should be treated as separate species.