Ten Mammillaria species compared through exact Wikimedia Commons photographs of stems, spines and flowers. An editorial selection, not a scientific ranking. Original video contributions: CC BY-SA 4.0. Individual photographs retain the licences and credits listed in attribution; public-domain and CC0 photographs remain so. Photograph credits: 1. File:MammillariaElongata2.jpg; Chhe ( talk ); Public domain; ; https://commons.wikimedia.org/wiki/File%3AMammillariaElongata2.jpg; Portrait crop and scaling; title and caption bars added. Scene 1 additionally crops the upper label. Photograph retains its original licence. 2. File:(MHNT) Mammillaria hahniana - Thorns and flower.jpg; Didier Descouens; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File%3A%28MHNT%29_Mammillaria_hahniana_-_Thorns_and_flower.jpg; Portrait crop and scaling; title and caption bars added. Scene 1 additionally crops the upper label. Photograph retains its original licence. 3. File:Mammillaria plumosa.JPG; Kauderwelsch; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File%3AMammillaria_plumosa.JPG; Portrait crop and scaling; title and caption bars added. Scene 1 additionally crops the upper label. Photograph retains its original licence. 4. File:Mammillaria bocasana 03 ies.jpg; Frank Vincentz; CC BY-SA 3.0; http://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File%3AMammillaria_bocasana_03_ies.jpg; Portrait crop and scaling; title and caption bars added. Scene 1 additionally crops the upper label. Photograph retains its original licence. 5. File:Mammillaria spinosissima by RO.jpg; Rationalobserver; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File%3AMammillaria_spinosissima_by_RO.jpg; Portrait crop and scaling; title and caption bars added. Scene 1 additionally crops the upper label. Photograph retains its original licence. 6. File:Mammillaria zeilmanniana.jpg; Michael Wolf; CC BY-SA 3.0; http://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File%3AMammillaria_zeilmanniana.jpg; Portrait crop and scaling; title and caption bars added. Scene 1 additionally crops the upper label. Photograph retains its original licence. 7. File:Mammillaria schiedeana Kh115 Khanon-215.jpg; Финитор , photo & selection: canonic Yuri Khanon; CC BY 4.0; https://creativecommons.org/licenses/by/4.0; https://commons.wikimedia.org/wiki/File%3AMammillaria_schiedeana_Kh115_Khanon-215.jpg; Portrait crop and scaling; title and caption bars added. Scene 1 additionally crops the upper label. Photograph retains its original licence. 8. File:Mammillaria longimamma pm.jpg; Peter A. Mansfeld; CC BY 3.0; https://creativecommons.org/licenses/by/3.0; https://commons.wikimedia.org/wiki/File%3AMammillaria_longimamma_pm.jpg; Portrait crop and scaling; title and caption bars added. Scene 1 additionally crops the upper label. Photograph retains its original licence. 9. File:Mammillaria bombycina7 ies.jpg; Frank Vincentz; CC BY-SA 3.0; http://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File%3AMammillaria_bombycina7_ies.jpg; Portrait crop and scaling; title and caption bars added. Scene 1 additionally crops the upper label. Photograph retains its original licence. 10. File:Mammillaria magnimamma toluca.JPG; Petar43; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File%3AMammillaria_magnimamma_toluca.JPG; Portrait crop and scaling; title and caption bars added. Scene 1 additionally crops the upper label. Photograph retains its original licence.