My fiancé has had this cactus for some time and we like to find out what genus and species it is. I hope someone can assist with the quest.

We thank you all for any info you can provide.

I don't know cacti at all but it reminds me of Elkhorn (Euphorbia lactea 'Cristata')

Well, disregard my last post; my eyesight is rather poor and now that I look at close ups, it doesn't appear to be Euphorbia lactea.

Hopefully someone who knows cacti and succulents will be along soon to point you in the right direction or offer an exact ID of your lovely plant!

It might be one called Ming Thing (Cereus forbesii montrose 'Ming Thing')

Thank you Daisyl, I was able to also find the same info. I am glad we finally have found the correct latin name for it.

That is definitely a very pretty 'Ming Thing' (Cereus forbesii montrose ). It seems like they do nothing at all for quite some time but if you watch them all of a sudden one day you'll see a lot of new 'nubs' and protuberances and some height. No rhyme or reason as to where on the plant this happens. Just keep your eyes on it for growth. Best advice I can give is make sure it is in a well draining pot and if outside cover it if there is a chance of frost.

Here are mine.

Ming Thing is the name.

Acanthocereus tetragonus 'Ming Thing'

There is some disagreement about the actual species name. It has been called many things because it's so weird looking and rather unlike the normal (non-monstrose) parent. A lot of sources call it Cereus validus. That name is treated as a synonym of C. hildmannianus by the Plant List and as a synonym of Acanthocereus tetragonus by the Catalogue of Life (whose choices are followed in the database here). So yeah Ming Thing is way better as a name for the monstrose plant.

Interesting fact: they do make flowers, rather large and warped looking, when they get old enough.