Myrtillocactus geometrizans 'Fukurokuryuzinboku'
Native range: Species can be found in Central and Northern Mexico
Known names: Boobie Cactus, Breast Cactus, Titty Cactus
Hardiness: Best kept above freezing, heat tolerant
Mature Size: ~12' tall, 
Light: Full sun 
Water: Drought tolerant, water when soil is dry.
Soil: Succulent mix
Dormancy Period: N/A
Pet-Safe: No
Plant Size: 4" pot, shipped bare-root
 
Called the "Boobie Cactus" for semi-obvious reasons. Blueish green skin, columnar growth habit, usually branching from the base.