Golden barrel cactus, saguaro, Indian fig opuntia, Thanksgiving cactus, two Astrophytum species, devil tongue barrel cactus, ladyfinger cactus, old man cactus and Echinopsis eyriesii. Compare stem shapes and visible details in documented photographs. An editorial selection, not a rarity ranking or a plant-care guide. Visuals are real Wikimedia Commons photographs, not AI-generated images. Narration is synthesized with Edge TTS. Photographs are resized and fitted to a portrait frame; derived images retain their source licenses. Golden barrel cactus: Agnieszka Kwiecień, Nova; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Echinocactus_grusonii_2019-05-29_01.jpg Saguaro: WClarke; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Carnegiea_gigantea_in_Saguaro_National_Park_near_Tucson%2C_Arizona_during_November_%2858%29.jpg Indian fig opuntia: YG01; CC BY 4.0; https://creativecommons.org/licenses/by/4.0/; https://commons.wikimedia.org/wiki/File:Dikenli_%C4%B0ncir_%28Opuntia_ficus-indica%29_Gaziantep_Turkey.IMG_1104.jpg Thanksgiving cactus: Trio3D; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Schlumbergera_truncata_%28new_stem_segments%29.jpg Star cactus: Petar43; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Astrophytum_asterias_50.JPG Bishop cap cactus: Krzysztof Golik; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Astrophytum_myriostigma_02.jpg Devil tongue barrel cactus: Agnieszka Kwiecień, Nova; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:Ferocactus_latispinus_2008-05-01_01.jpg Ladyfinger cactus: Photo by David J. Stang; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Mammillaria_elongata_1zz.jpg Old man cactus: Photo by David J. Stang; CC BY-SA 4.0; https://creativecommons.org/licenses/by-sa/4.0/; https://commons.wikimedia.org/wiki/File:Cephalocereus_senilis_1zz.jpg Echinopsis eyriesii: Teun Spaans; CC BY-SA 3.0; https://creativecommons.org/licenses/by-sa/3.0/; https://commons.wikimedia.org/wiki/File:ZTS_F297_Echinopsis_eyriesii.JPG