Papaver mexicanum (L.) E.H.L.Krause = Argemone mexicana L.
English:
mexicanus,-a,-um;

https://archive.org/stream/#page/12/mode/2up
homotypic synonyms:
Argemone mexicana L.; Echtrus mexicanus (L.) Nieuwl.;

protologue: Deutschl. Fl., ed. 2 6: 12 (1902)

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