Tiny Bubbles
Matucana madisoniorum
These tiny barrels are often flattened in shape, usually solitary, from high in the Andes of Peru, like all the cool cactus kids these days. They get orange/red funnel-shaped flowers, so I’m told, but I haven’t seen them yet, so I cannot verify this. But they do bloom young, and only get to around 4 to 6 inches across. Very rare in the wild because of over-collection, so get your specimen from a seed-grown source.