`nylon hedgehog cactus` flowers - echinocereus viridiflorus

arboretum bloom blossom botanic botanical botany bright cactaceae cacti cactoideae cactus caryophyllales desert dry echinocereus europe european florist flowered flowers gallen garden green hedgehog mexican mexico natural nature nylon pachycereeae petals pitaya plants pollen saint shiny small spine spring succulent summer swiss switzerland synthetic texas thorn thorny viridiflorus yellow