Consolea moniliformis

About

Consolea moniliformis is a species of cactus that is native to the Greater Antilles, on Cuba, Hispaniola, and Puerto Rico. The species forms small shrubs, with vividly green falciform pads and is often growing near the coast. On Hispaniola it is often confused with Consolea testudinis-crus a species that forms large tree-like plants with bluish-grey pads, in Puerto Rico it is at times confused with Consolea rubescens.

Summary from Wikipedia