| Ferocactus wislizeni | 
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| Scientific classification  | 
| Kingdom: | 
Plantae | 
 
| Clade: | 
Tracheophytes | 
 
| Clade: | 
Angiosperms | 
 
| Clade: | 
Eudicots | 
 
| Order: | 
Caryophyllales | 
 
| Family: | 
Cactaceae | 
 
| Subfamily: | 
Cactoideae | 
 
| Genus: | 
Ferocactus | 
| Species: | 
F. wislizeni  | 
| Binomial name | 
Ferocactus wislizeni
  | 
| Synonyms | 
- 
- Echinocactus wislizeni Engelm. 1848
 
- Echinocactus arizonicus R.E.Kunze 1909
 
- Echinocactus falconeri Orcutt 1902
 
- Echinocactus wislizeni var. albispinus Toumey 1895
 
- Echinocactus wislizeni f. albispinus (Toumey) Schelle 1926
 
- Echinocactus wislizeni var. albus Costantin & Poiss. 1907
 
- Echinocactus wislizeni var. decipiens Engelm. 1878 publ. 1879
 
- Echinocactus wislizeni var. latispinus Schelle 1907
 
- Echinocactus wislizeni f. phoeniceus (R.E.Kunze) Schelle 1926
 
- Echinocactus wislizeni var. phoeniceus R.E.Kunze 1913
 
- Ferocactus arizonicus (R.E.Kunze) Orcutt 1926
 
- Ferocactus falconeri (Orcutt) Orcutt 1926
 
- Ferocactus phoeniceus (R.E.Kunze) Orcutt 1926
 
- Ferocactus wislizeni subsp. ajoensis Fencl & Kalas 2013
 
- Ferocactus wislizeni var. ajoensis Fencl & Kalas 2012
 
- Ferocactus wislizeni var. albispinus (Toumey) Y.Itô 1952
 
- Ferocactus wislizeni var. flalconeri (Orcutt) Y.Itô 1981
 
- Ferocactus wislizeni var. phoeniceus (R.E.Kunze) Y.Itô 1952
  
  
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Ferocactus wislizeni, the fishhook barrel cactus, also called Arizona barrel cactus, candy barrel cactus, and Southwestern barrel cactus, is a species of flowering plant in the cactus family Cactaceae, native to northern Mexico and the southern United States. It is a ball-shaped cactus eventually growing to a cylindrical shape, with spiny ribs and red or yellow flowers in summer. 
Some sources mistakenly spell the epithet "wislizenii." The correct spelling is with one "i," per ICN article 60C.2.