Lectotypification of Two Names of Psephellus Sect. Czerniakovskya (Asteraceae, Cardueae–Centaureinae), With Notes on Their Distribution and a Diagnostic Key

Key Points

• This research aims to clarify the taxonomy of two species within Psephellus sect. Czerniakovskya.
• Lectotypified two names, P. iljinii and P. kopet-daghensis, using specimens at LE.
• Presented the distribution area for both species.
• Developed a diagnostic taxonomic key for the species of P. sect. Czerniakovskya.
• Established lectotypes for P. iljinii and P. kopet-daghensis.
• Detailed the distribution areas of both species.
• Provided a comprehensive taxonomic key for identification.