Ten Ferocactus species in exact photographs: compare stem shapes and ribs and spines. An editorial selection, not a scientific ranking. Video contributions CC BY-SA 4.0; individual photographs retain the source licences and credits listed below. Photograph credits: 1. File:Flor de Ferocactus latispinus.jpg; Juan Carlos Fonseca Mata; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Flor_de_Ferocactus_latispinus.jpg; Full photograph fit, scaling and caption panels. 2. File:Ferocactus glaucescens (14126550259).jpg; Dick Culbert from Gibsons, B.C., Canada; CC BY 2.0; https://creativecommons.org/licenses/by/2.0; https://commons.wikimedia.org/wiki/File:Ferocactus_glaucescens_(14126550259).jpg; Full photograph fit, scaling and caption panels. 3. File:Ferocactus pilosus1.jpg; MPF; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:Ferocactus_pilosus1.jpg; Full photograph fit, scaling and caption panels. 4. File:Fishook Barrel Ferocactus wislizeni.jpg; Susan Lynn Peterson Sue in az; CC BY 3.0; https://creativecommons.org/licenses/by/3.0; https://commons.wikimedia.org/wiki/File:Fishook_Barrel_Ferocactus_wislizeni.jpg; Subject-centered crop, fit, scaling and caption panels. 5. File:Ferocactus cylindraceus 10.jpg; Stan Shebs; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:Ferocactus_cylindraceus_10.jpg; Subject-centered crop, fit, scaling and caption panels. 6. File:Ferocactus hamatacanthus pm.JPG; Peter A. Mansfeld; CC BY 3.0; https://creativecommons.org/licenses/by/3.0; https://commons.wikimedia.org/wiki/File:Ferocactus_hamatacanthus_pm.JPG; Full photograph fit, scaling and caption panels. 7. File:Ferocactus histrix (1).jpg; Amante Darmanin from Malta; CC BY 2.0; https://creativecommons.org/licenses/by/2.0; https://commons.wikimedia.org/wiki/File:Ferocactus_histrix_(1).jpg; Full photograph fit, scaling and caption panels. 8. File:Saguaro National Park 1989 12.jpg; LBM1948; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0; https://commons.wikimedia.org/wiki/File:Saguaro_National_Park_1989_12.jpg; Full photograph fit, scaling and caption panels. 9. File:Ferocactus macrodiscus (5742292875).jpg; Amante Darmanin from Malta; CC BY 2.0; https://creativecommons.org/licenses/by/2.0; https://commons.wikimedia.org/wiki/File:Ferocactus_macrodiscus_(5742292875).jpg; Full photograph fit, scaling and caption panels. 10. File:Ferocactus robustus 001.JPG; H. Zell; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0; https://commons.wikimedia.org/wiki/File:Ferocactus_robustus_001.JPG; Full photograph fit, scaling and caption panels.