Poppies
- Photographic study by John Garrett of these plants and Papaver rhoeas in particular.
- http://www.microscopy-uk.org.uk/mag/artsep99/poppies.html

Papaver dubium
- Several photographs of the Long-headed Poppy, and information on features helping in its identification.
- http://www.plant-identification.co.uk/skye/papaveraceae/papaver-dubium.htm

Papaver hybridum (Rough Poppy)
- Information and photo from Malta.
- http://www.marz-kreations.com/WildPlants/PAPV/Papaver_hybridum.html

Papaver rhoeas (Common Poppy)
- Photos and information from Stephen Mifsud of Malta.
- http://www.marz-kreations.com/WildPlants/PAPV/Papaver_rhoeas.html

Papaver somniferum
- Image gallery of various Papaver somniferum varieties.
- http://www.poppies.org/gallery/

Papaver rhoeas
- microscopic image
- http://www.dipbot.unict.it/sistematica/Papaver.html

Papaver orientale
- image
- http://www.botany.hawaii.edu/faculty/carr/images/pap_ori.jpg