This work constitutes a systematic treatment of the Cactaceae family found in the "Pico do Jabre", Paraíba, Brazil. The study-area is the highest peak in the Northern part of Northeastern Brazil and consists of an isolated portion of humid forest, one of the few in the State of Paraíba, included in the the domain of the Atlantic Forest. In the "Pico do Jabre" the Cactaceae family is represented by three genera and four species: Cereus jamacaru DC., Melocactus ernestii Vaupel, Pilosocereus chrysostele (Vaupel) Byles & Rowley and Pilosocereus gounellei (F.A.C.Weber)Byles & Rowley.
Cactaceae; Pico do Jabre; Paraíba; Northeastern Brazil
