Matucana krahnii (Donald) R. Bregman
Growth Habits: Clumping globose cactus, up to 2.5 inches in diameter (6 cm)
Scientific name: Matucana krahnii.
Common names: None.
Synonym: Borzicactus krahnii, Matucana calliantha
Etymology: Matucana Named after the small Peruvian town 50 miles east of Lima, where they grow at 6,000-13,000 feet
Named after Wolfgang Krahn, a well known plantsman from Stutgart.
Origin: Amazonas, Peru
Light: Good light but not severe sunlight.
Compost: A free draining standard cactus mix.
Water: Regular water in spring to autumn allowing soil to dry between waterings, keep dry in winter.
Flower: Deep red and lilac.
Min temp: Minimum temperature of 10° C (50° F), but may survive a light frost.
http://ralph.cs.cf.ac.uk/Cacti/fieldno.html ralph martin
Comments. Remains quite a small plant, well worth growing for its vividly coloured flowers.
Flower close up
Mature plant. photographer Daiv Freeman