Oreomecon
Oreomecon is a genus in the poppy family Papaveraceae. It was established in 2022 for what was previously treated as Papaver sect. Meconella in order to ensure that the genus Papaver was monophyletic. , names in the genus Oreomecon had only been published for better known and phylogenetically understood species present in Europe, either as natives or aliens.

Taxonomy
Molecular phylogenetic studies of the genus Papaver from 1997 onwards showed that as then circumscribed, the genus was not monophyletic. Three clades could be distinguished  within the original circumscription of Papaver: Papaver sensu stricto, Papaver sect. Meconella, and a combination of Papaver sect. Argemonidium and Roemeria. Meconopsis (excluding Meconopsis cambrica) made up a fourth clade, embedded within the original circumscription of Papaver. A 2006 study suggest the four clades were related as shown in the following cladogram:

Subsequently, Meconopsis cambrica and Stylomecon were transferred to Papaver, and Roemeria expanded to include Papaver sect. Argemonidium. In 2022, the genus Oreomecon was established and some better known and understood species present in Europe, either natives or alien, were transferred to that genus.

Papaver sect. Meconella could not be raised to the rank of genus under the name Meconella because Meconella Nutt. was already used for a group of American species of poppies, hence a new name was required. Oreomecon is derived from , hence 'mountain poppy'.

Species
Sources differ in number of species placed in Papaver sect. Meconella (and thus open to transfer to Oreomecon). In 2006, a range of 24 to 30 species was suggested. The Papaver alpinum group has been treated particularly variably, with one to seven or more species accepted, along with numerous subspecies.  A 2009 study concluded that "most previous taxonomic concepts of P. alpinum s.l. were highly artificial" and recognized only one species, with possibly two subspecies.

, Plants of the World Online (PoWO) listed in Oreomecon only the six species transferred in 2022:
Papaver alpinum L. → Oreomecon alpina (L.) Banfi, Bartolucci, J.-M.Tison & Galasso
Papaver anomalum Fedde  → Oreomecon anomala (Fedde) Banfi, Bartolucci, J.-M.Tison & Galasso
Papaver croceum Ledeb. → Oreomecon crocea (Ledeb.) Banfi, Bartolucci, J.-M.Tison & Galasso
Papaver miyabeanum Tatew. → Oreomecon miyabeana (Tatew.) Banfi, Bartolucci, J.-M.Tison & Galasso
Papaver nudicaule L. → Oreomecon nudicaulis (L.) Banfi, Bartolucci, J.-M.Tison & Galasso
Papaver radicatum Rottb. → Oreomecon radicata (Rottb.) Banfi, Bartolucci, J.-M.Tison & Galasso

, the Germplasm Resources Information Network (GRIN) listed 11 species in Papaver sect. Meconella, of which the following are additional to those listed above: 
Papaver alboroseum Hultén
Papaver aurantiacum Loisel. – included in Oreomecon alpina by PoWO
Papaver dahlianum Nordh.
Papaver lapeyrouseanum Gutermann ex Greuter & Burdet – included in Oreomecon alpina by PoWO
Papaver lapponicum (Tolm.) Nordh.
Papaver macounii Greene
Papaver pseudocanescens Popov
Papaver rubroaurantiacum (Fisch. ex DC.) Fisch. ex Steud.

References

Papaveroideae
Papaveraceae genera