That looks like Cleistocactus brookeae , not Hildewinteria aureispina (= C. winteri ). Agreed, the flower does, but Cleistocactus brookeae is erect, not lax. Actually, some forms of Cleistocactus brookeae are indeed pendant (not just ssp vulpis-cauda ). See Lowery's Synopsis of Cleistocactus from B...

That looks like Cleistocactus brookeae, not Hildewinteria aureispina (=C. winteri).

Spectacular! Thanks!

Gorgeous! How large are the plants? Would love to see pics of the entire plant!

I echo Michiel - that is a really nice looking seedling, so you've clearly done well with it. Very jealous - one of my favorite genera, but you can't find a hint of many of the species in the states.

Corryocactus erectus seems to be quite variable, even in habitat. I have clones of that species from habitat that match the spination on your exactly. I don't have a lot of experience with C. apiciflorus myself (had one plant that flowered then promptly died on me for unknown reasons), but from wha...