Strophocactus brasiliensis

Strophocactus brasiliensis, synonym Pseudoacanthocereus brasiliensis, is a species of plant in the family Cactaceae. It is endemic to Brazil. Its natural habitats are subtropical or tropical dry forests and hot deserts. It is threatened by habitat loss.
Description.
"Strophocactus brasiliensis" grows as a shrub, initially upright and later sprawling. It branches freely. The thin stems are up to across and have 2–7 ribs bearing small areoles with many needle-like spines. The white funnel-shaped flowers are long and across. They open at night. The fruits are yellow when ripe.
Taxonomy.
"Strophocactus brasiliensis" was first described, as "Acanthocereus brasiliensis", by Britton and Rose in 1920. It was transferred to the genus "Pseudoacanthocereus" as "Pseudoacanthocereus brasiliensis" by Friedrich Ritter in 1979, a placement still accepted by some sources . A molecular phylogenetic study of the Hylocereeae by Korotkova et al. published in 2017 showed that "Pseudoacanthocereus brasiliensis" formed a clade with "Strophocactus wittii" and "Pseudoacanthocereus sicariguensis" (the only other species placed in "Pseudoacanthocereus"):
Accordingly, both species of "Pseudoacanthocereus" were transferred to "Strophocactus".
Distribution and habitat.
"Strophocactus brasiliensis" is native to Northeast and Southeast Brazil. It is found in the eastern caatinga ecoregion, an area of thorn scrub and seasonally dry forests.