| Family: | Cactaceae (kak-TAY-see-ee) (Info) |
| Genus: | Echinocereus (ek-in-oh-KER-ee-us) (Info) |
| Species: | poselgeri (pos-EL-ger-ee) (Info) |
| Synonym: | Wilcoxia poselgeri |
| Synonym: | Wilcoxia waldeisii |
| Synonym: | Echinocereus waldeisii |
| Synonym: | Echinocereus tamaulipensis subsp. waldeisii |
| Synonym: | Echinocereus tamaulipensis subsp. deherdtii |