Ключевые слова: angiosperms, cactacea, cactoidea, cactus, cactus spine, cactus thorn, caryophyllales, core eudicots, eudicots, hylocereea, hylocereus, hylocereus undatus, magnoliopsida, plant, red pitaya, spermatophytes, spermatophytina, spine, thorn, tracheophyta, tracheophytes,