This bona fide Cereus colosseus is quite a different plant.

AKA Piptanthocereus colosseus

Represented at Huntington under the synonym
Cereus lamprospermus ssp. colosseus
HBG 72665 ex Tegeriberg [Tegerlberg?] ex F. Ritter

Tag reads:
Bolivia
Massive shrub to 50 foot
Full sun
Hardy to the teens