2. Roemeria Medik., Ann. Bot. (Usteri) 1 (3): 15. 1792

Type species.

Roemeria violacea Medik., nom. illeg. [≡ R. hybrida (L.) DC.]

Notes.

The genus is summarised here as including 16 species and one subspecies according to the treatment by Hassler (2023 b). As shown by Fig. 2, the genus has a similar distribution to Papaver, but is absent from most parts of the Macaronesian Islands. It is present in Great Britain and southernmost Scandinavia, while it is absent from large parts of Central European Russia, the Arabian Peninsula and the Himalayan foothills. Roemeria may have had a long presence in Central Asia prior to the uplift of the Qinghai-Tibetan Plateau, based on its phylogenetic history illustrated in Fig. 1. Today, it extends as far east as Mongolia, represented by the species R. refracta DC. (Baasanmunkh et al. 2022) .