This cactus is labelled column cactus but I think thats just a description not a name. Please help identify this columnar cactus. It is 6 feet tall with 4 arms starting at the ground. Growing in Quartzsite Arizona and probably 25 years old. Please identify with a common and scientific name.

Looks like a senita (Pachycereus schottii, also known as Lophocereus schottii, with various other common names) or something very close to it. A Sonoran Desert native that we also have in Baja California. Pollinated by a moth.

For example:



Here for comparison are juvenile and mature spination of this plant in habitat.




More details here

https://garden.org/thread/post...

I need some help identifying this cactus growing in Quartzsite AZ

Myrtillocactus. Most likely



A little unusual for a cactus in having multiple flowers per areole. Edible fruit, like a berry.

i guessed blue myrtle. Are the buds edible or the fruit only?

I don't know, I have only tried the fruit.

I would stick with the fruit.