Arthrocereus

Morphological Summary

Genus of slender and articulated columnar cacti endemic to the rupestrian grasslands and quartzitic outcrops of the state of Minas Gerais, Brazil, with 3–4 accepted species. Their thin, very spiny stems produce white to pinkish flowers that open at night, often fragrant, with a very long style. Related to Disocactus and the epiphytic clade, but terrestrial. They inhabit crevices of quartzitic rocks at elevations of 900–2,000 m.