This charming globular cactus offsets to form freely-flowering clumps. The zygomorphic flowers open sideways like small, colorful periscopes and can appear repeatedly over several weeks in summer. Our plants came to us under the unpublished name of Matucana mammillaris with the Karel Knize collection number KK 1639, which is supposed to be Pereskia saccharosa. In any case, the species is known only from near El Chagual, along the Río Marañón, La Libertad, Peru. HBG 123346. $7.