Echinocereus rigidissimus f. crested (Crested)

Also called "Rainbow cactus", because with the prolonged exposure to the direct sun, it takes on shades, ranging from pink to red or purple. It is a cactus with a crested shape, which makes each specimen unique in its kind and therefore highly sought after by green collectors. It has a green stem with tubercles, from which combed and rigid spines emerge, hence the name 'rigidissimus'. It is a cactus that is difficult to cultivate and for this reason it is often found grafted onto other plants.