Hildewintera Lilo Fee
Also known as a Cleistocactus hybrid.
The images don't really convey how spectacular this is, at 10cm diameter, wider than the palm of my hand.
The stems tend to curve as the plants grow larger.
The stamens are immature.
Olympus EM-1, (aperture priority), Olympus 4/3 50mm f2 macro, 1/50 at f11 & 1/30 at f8, hand-held.
The stereos are crosseye.