Notes on taxonomy of Erysimum (Erysimeae, Cruciferae) of Russia and adjacent states. II. Middle Asian purple- and orange-flowered species

Abstract

Results of taxonomic revision of Middle Asian violet- and orange-flowered wallflowers are presented. Five (vs. eight as traditionally considered) species are recognised. Thus, A. Polatschek’s four-species concept introduced in 2010 is generally supported in terms of lower species diversity of the group in question, though nomenclature is updated in various details including the newly proposed assignment of E. jodonyx to synonymy of E. samarkandicum. Lectotypes are designated for the names E. cyaneum, E. epikeimenum, E. franchetii, E. purpureum var. turkestanicum, E. samarkandicum, E. tianschanicum and E. violascens var. tschimganicum; typification of E. franchetii established on the taxonomically heterogenous material is done in agreement with its existing usage as a synonym of E. samarkandicum (not E. violascens). Redundancy of lectotypification of E. alaicum for which the holotype is extant is demonstrated. Further aspects of systematics, nomenclature, morphology and geography of the treated species are briefly discussed as well.

Keywords

• botanical nomenclature
• brassicaceae
• kazakhstan
• kyrgyzstan
• synonymy
• tajikistan
• taxonomic revision
• typification
• uzbekistan
• wallflower