A revision of some critical questions of taxonomy of central‐ and south‐asian genera of the Umbelliferae Vicatia, Sinodielsia, and Tongoloa have been carried out. The identity of centralasiatic Carum atrosanguineum with V. wolffiana but not with V. coniifolia have been indicated and, as a result, a new combination — V. atrosanguinea — have been proposed. A new species of this genus — V. nepalensis — was described from Nepal. Using cluster analysis and principal coordinate analysis and basing on the distribution of the states of 13 characters in known species the relationships between Vicatia, Tongoloa and Sinodielsia have been investigated and the limits of the three genera were elucidated. Three new combinations within genera Sinodielsia and Tongoloa have been proposed. A key identification of the above mentioned genera have been compiled. Copyright © 1991 Wiley‐VCH