Rhodocactus nemorosus is a species of flowering plant in the cactus family Cactaceae, native to southern Brazil, Paraguay, Uruguay and northeast Argentina.

[2] Rhodocactus nemorosus grows as a small tree or a shrub, reaching 3–5 m (10–16 ft) high, with trunks to 10 cm (4 in) in diameter.

The white to pale pink flowers are either solitary or borne in small terminal inflorescences of two to five, and are 4–7 cm (1.6–2.8 in) across.

[2] Molecular phylogenetic studies suggested that when broadly circumscribed, Pereskia was not monophyletic, and consisted of three clades.

[4] Rhodocactus nemorosus is native to southern Brazil, Paraguay, Uruguay and northeast Argentina.