Tephrocactus articulatus (ROOTED in 3.5" Pot)
These are well rooted in 3.5" pots (full tray pictured)
I like to call this plant "The Mad Scientist" because the modified spines remind me of mad scientist's hair
Tephro = Paper in latin; because of the interesting paper-like spines.
These will be shipped pot and all, to disturb the plant as little as possible.
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