Pimenov, M. G., Kljuykov, E. V. & Ostroumova, T. A.: Critical taxonomic analysis of Dichoropetalum, Johrenia, Zeravschania and related genera of Umbelliferae-Apioideae-Peucedaneae. — Willdenowia 37: 465–502. — ISSN 0511-9618; © 2007 BGBM Berlin-Dahlem. doi:10.3372/wi.37.37208 (available via  http://dx.doi.org/)

During critical investigation of the Umbelliferae in the Near East, N Africa and Europe some additional species were found to be putative relatives of Johrenia and the Peucedanum segregate Johreniopsis. A comparative multivariate analysis of 41 species, based on 32 morphological diagnostic characters, revealed a revised taxonomic grouping of the species. The forgotten generic name Dichoropetalum, typified by D. alpinum, is restored to accommodate a group of 26 SW Asian and Mediterranean species, including species of the former genera Johreniopsis and Holandrea (now regarded as sections), as well as some Peucedanum and Johrenia species. We recognize six sections in Dichoropetalum, of which three are described as new. Two species of Johreniopsis, poorly known before, are transferred to Zeravschania. Johrenia, on the contrary, is regarded as a genus with five species only. Johrenia westii, which requires further investigation, belongs most probably to the genus Ferulago. 28 new nomenclatural combinations are validated and lectotypes are designated for several names.