Habitat: Argentina. Description: a genus of small cacti with cylindrical, sometimes
jointed stems. They have fleshy roots and areoles with tiny spines. The
plants produce yellow or white flowers near its apex. Soil: basic mix. Location: full sun. Temperature: a minimum temperature around 6-8°C (43-46°F). Water: average. Cultivation tips: propagation is from seed or cutting. Main species: P. reticulatus; P. hickenii; P. gonjianii; P.
kuntzei syn. P. tuberosus syn. P.decipiens.