Stenocactus vaupelianus (Werderm.) F.M.Knuth 1935
Growth Habits: Globular plant getting slightly taller with age, solitary but may clump in cultivation.
Scientific name: Stenocactus vaupelianus
Common names: None.
Synonym: Ferocactus vaupelianus, Echinocactus albatus, Stenocactus albatus, Efossus albatus, Brittonrosea albata, Stenocactus rectispinus, Echinocactus vaupelianus, Echinofossulocactus vaupelianus, Echinofossulocactus albatus
Etymology: From the Greek words stenos, meaning narrow, and kaktos, meaning thistle.
Named after Prof. Vaupel
Origin: Mexico (Hidalgo)
Light: Full sun to light shade.
Compost: A free draining standard cactus mix.
Water: Regular water in spring to autumn.
Flower: Pale yellow to whitish.
Min temp: Hardy to 25°F (-4°C), for short periods if kept dry.
Cultivation: Easy to grow plant with the usual cactus environment.
References. http://www.desert-tropicals.com
http://www.cactiguide.com/etymology_genera/
another image showing flowers