Lava cactus
| Lava cactus | |
|---|---|
| Scientific classification | |
| Kingdom: | Plantae | 
| Clade: | Tracheophytes | 
| Clade: | Angiosperms | 
| Clade: | Eudicots | 
| Order: | Caryophyllales | 
| Family: | Cactaceae | 
| Subfamily: | Cactoideae | 
| Tribe: | Echinocereeae | 
| Genus: | Brachycereus Britton & Rose  | 
| Species: | B. nesioticus  | 
| Binomial name | |
| Brachycereus nesioticus | |
| Synonyms | |
| 
 Cereus nesioticus K.Schum.  | |
The lava cactus is a species of cactus, Brachycereus nesioticus, the sole species of the genus Brachycereus. The plant is a colonizer of lava fields – hence its common name – where it forms spiny clumps up to 60 cm (24 in) tall. Its solitary white or yellowish white flowers open in the daytime. It is endemic to the Galápagos Islands.