Echinocereus rigidissimus, commonly known as the Arizona Rainbow Cactus or Rainbow Hedgehog Cactus is a solitary, growing cactus, that rarely branches or offsets with age. The radial spines curved slightly towards the stem, the new spines are initially reddish to magenta and fades to a yellow or light pink colour when they mature. They bloom the spring season, with multiple buds borne atop the plant from younger areoles, the flowers are bright pink in colour with a white coloured throat.
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