mystery crested cactus--ID assistance please

[bigdaddyscondition]

My sister-in-law saw this gnarly beauty in Monaco. Don't know if it's in a botanical garden or private collection. It looks to me like a crested form of saguaro cactus, but that's just a guess. Anybody care to hazard a guess?

crested cactus.jpg (17.5 KiB) Viewed 325 times

[Gee.S]

Could be a saguaro, can't be sure...

[Paul S]

Hard to tell from that avatar-sized picturette. Could be Trichocereus terscheckii, which is more common in European collections than saguaro.

[bigdaddyscondition]

You may be right, Paul. Here's a brief video of a population of that species in northern Argentina. It shows at least one crested form (starting at 5:15). It's an obviously anecdotal observation, but in driving through Arizona I don't recall having seen any crested saguaros.