The photo catalog of my rooftop garden is on line for all to enjoy at http://Selva.Cabal.mx Richard

It’s so kind of you for coming back and share with us the ID. As always you do have a plethora of interesting plants and the super bargain low, low prices you paid to acquire them. Too bad we couldn’t buying & bringing them back to the US. Guess, I will have to looking at your photos and admiring from the computer screen. Best wishes Richard1 Laura

We have decided that it is a stenocereus eruca Thanks Richard

Trichoecereus are often missidentified. This page has great description for various genera. http://www.tucsoncactus.org/html/growing_succulents_in_the_desert_column_May_2010.html

This link has pages for species, hybrids, etc… https://trichocereus.net/1-trichocereus-species

Maybe a species or a hybrid in the Echinopsis/Trichocereus depending which sources. The link below with more information of the taxonomy. On the side note, that’s a beautiful specimen you have there Richard! Maybe you post some photos when its flowers. Best wishes! https://en.wikipedia.org/wiki/Echinopsis