Taraxacum sect. Borealia Handel-Mazzetti (1907

Kirschner, Jan, Štěpánek, Jan & Buryy, Vladimir V., 2025, Towards a revision of Taraxacum sect. Borealia (Compositae, Crepidinae) in Siberia and the continental Far East, with special reference to the dandelions of the Altai and Kamchatka, Phytotaxa 679 (1), pp. 1-147 : 3

Introduction ...................................................................................................................................................................................................5 Literature sources of our study ...........................................................................................................................................................5 The level of exploration......................................................................................................................................................................6 A summary of the nomenclature at the supraspecific ranks ...............................................................................................................6 Taraxacum sect. Borealia Handel-Mazzetti (1907 : [xi]) ..................................................................................................................6 Morphological features best characterizing Taraxacum sect. Borealia ..............................................................................................7 Where to draw a line between Taraxacum sect. Borealia and T. sect. Arctica ...................................................................................7 Reproduction systems in Taraxacum sect. Borealia ...........................................................................................................................7 Problems encountered in the study of Taraxacum sect. Borealia .......................................................................................................7 The problematic character of the original material of many names...................................................................................................8 A note on the recently published Taraxacum names by Kharitontsev (2014, 2015)..........................................................................9

Material and Methods ..................................................................................................................................................................................9 Species concept ..................................................................................................................................................................................9 How to understand the plasticity of dandelions .................................................................................................................................9 Plant material....................................................................................................................................................................................10 Methods of cultivation......................................................................................................................................................................10 Images...............................................................................................................................................................................................10 Nomenclature ...................................................................................................................................................................................11

Results ..........................................................................................................................................................................................................11

Interpretation of the name Taraxacum ceratophorum ( Ledebour 1829: 9) Candolle (1838: 146) .......................................................11 Protologue......................................................................................................................................................................................... 11 Specimens belonging to the original material ..................................................................................................................................11 A survey of characters that can be observed on the lectotype and isotype plants ............................................................................12 Interpretation ....................................................................................................................................................................................13 Nomenclatural consequences ...........................................................................................................................................................13

Survey of taxa accepted ..............................................................................................................................................................................13

Key categories ..............................................................................................................................................................................................13

A key to the identification of members of T. sect. Borealia in the study area ........................................................................................14