Echinocereus engelmannii

Echinocereus engelmannii - cactus King of the West. It is the species that along with some Opuntias covers the most territory. Large area means lots of variability.
The form in the picture grows in the surroundings of Death Valley. It is probably the most striking form with longest spines, bi-colored white and yellow to brown.
It is relatively easy to grow plant, that requires late winter - early spring watering along with plenty of sun for successful flowering.