Taxonomy
Divided into a number of sections by Kiger (1973, 1985), the following are lectotypified with their lectotype species. Subsequent cladistic classification by Carolan et al. (2006) suggested Papaver was not monophyletic.
- Clade 1. Meconella, Meconopsis
- Clade 2. Carinatae, Meconidium, Oxytona, Papaver, Pilosa, Pseudopilosa, Meconopsis cambrica, Californicum, Horrida, and Rhoeadium
- Clade 3. Argemonidium, Roemeria refracta
The following are lectotypified with their lectotype species:
- Carinatae (P. macrostomum Boiss. & Huet)
- Oxytona (P. orientale L.)
- Macrantha (P. orientale L.)- superfluous
- Calomecon (Calomecon orientale)
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