Mexican Poppy (Eschscholzia californica mexicana, german: Kalifornischer Mohn, french: Pavot de Californie). It is endemic to the south-western parts of the USA and northern México. (765k)
Here are the pictures of Mexican Poppy (Eschscholzia californica mexicana) with links to the pages on which they appear, links to the full sized picture, and the description of the picture with links to the entry in iNaturalist (inaturalist.org)
All pictures are © Dr. Günther Eichhorn, unless otherwise noted.
USA Nature
Dr. Günther Eichhorn Travel Website
Soaring website