On the basis of extensive molecular data and comparative morphological studies, the genera Ermania, Gorodkovia, Hedinia, Hediniopsis, Redowskia, Sinosophiopsis, and Sophiopsis, which form a mono-phyletic group with Smelowskia, are herein united with Smelowskia, a recently conserved generic name. Seven new combinations are proposed in Smelowskia: S. bartholomewii, S. czukotica, S. furcata, S. heishuiensis, S. jacutica, S. micrantha, and S. sophiifolia. A key to the 25 species of Smelowskia, as well as a detailed description of the expanded genus, major synonymies, and distributions are given.