Ten Gymnocalycium species compared through exact photographs of ribbed cactus stems, spines and flowers. An editorial selection, not a scientific ranking. Original video contributions CC BY-SA 4.0. Photographs retain their individual licences and attribution listed below. Photograph credits: 1. File:Gymnocalcium baldianium.jpg; Dake (fr:Utilisateur:Dake); CC BY-SA 3.0; http://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Gymnocalcium_baldianium.jpg; Whole photograph scaled and fitted, without crop; title and caption bars added. 2. File:Gymnocalycium mihanovichii 16.JPG; Petar43; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Gymnocalycium_mihanovichii_16.JPG; Whole photograph scaled and fitted, without crop; title and caption bars added. 3. File:Gymnocalycium Saglionis.JPG; Volumineux 13:26, 7 April 2008 (UTC); CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Gymnocalycium_Saglionis.JPG; Whole photograph scaled and fitted, without crop; title and caption bars added. 4. File:Gymnocalycium pflanzii pm1.jpg; Peter A. Mansfeld; CC BY 3.0; https://creativecommons.org/licenses/by/3.0; https://commons.wikimedia.org/wiki/File:Gymnocalycium_pflanzii_pm1.jpg; Whole photograph scaled and fitted, without crop; title and caption bars added. 5. File:Gymnocalycium denudatum 1.JPG; Petar43; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:Gymnocalycium_denudatum_1.JPG; Whole photograph scaled and fitted, without crop; title and caption bars added. 6. File:Gymnocalycium gibbosum.jpg; Michael Wolf; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:Gymnocalycium_gibbosum.jpg; Whole photograph scaled and fitted, without crop; title and caption bars added. 7. File:Gymnocalycium bruchii.JPG; Marco Wentzel, Deutschland/Germany, MarcoPedia ( talk ) 22:11, 27 November 2016 (UTC); CC BY 4.0; https://creativecommons.org/licenses/by/4.0; https://commons.wikimedia.org/wiki/File:Gymnocalycium_bruchii.JPG; Whole photograph scaled and fitted, without crop; title and caption bars added. 8. File:Gymnocalycium mostii 1.jpg; Rosario; CC BY 4.0; https://creativecommons.org/licenses/by/4.0; https://commons.wikimedia.org/wiki/File:Gymnocalycium_mostii_1.jpg; Whole photograph scaled and fitted, without crop; title and caption bars added. 9. File:Gymnocalicium multiflorum 3.JPG; Winfried Bruenken ( Amrum ); CC BY-SA 2.5; https://creativecommons.org/licenses/by-sa/2.5; https://commons.wikimedia.org/wiki/File:Gymnocalicium_multiflorum_3.JPG; Whole photograph scaled and fitted, without crop; title and caption bars added. 10. File:Gymnocalycium ochoterenae 10.png; KP Laer; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Gymnocalycium_ochoterenae_10.png; Whole photograph scaled and fitted, without crop; title and caption bars added.