Mojave Mound Cactus, Giant Claret Cup, Salmon-flowered Hedgehog, Spiny Hedgehog

Other valid synonyms of the species and the 'polyacanthus' subspecies are:
Cereus leanus
Cereus leeanus
Echinocereus...Read More leanus
Echinocereus santaritensis
Echinocereus acifer subsp. tubiflorus
Echinocereus multicostatus
Echinocereus acifer var. durangensis
Echinocereus polyacanthus subsp. mombergerianus
Echinocereus pacificus subsp. mombergerianus
Echinocereus triglochidiatus var. polyacanthus

This plant (and subspecies) can form clumps with as many as 400 heads
The 'polyacanthus' subspecies has smaller flowers being only 1.2 to 2.8 inches across. This is the most common of these subspecies.
The 'acifer' subspecies has scarlet red flowers that are 2.4 to 3.1 inches across and the stigma having 9 or 10 lobes.
The 'huitcholensis' subspecies has narrow salmon-pinkish orange blooms that are 1.8 to 3.1 inches across.
The 'pacificus' subspecies has smaller flowers than the other 3 subspecies being only 1.2 long and bright orange.