[2] Armatocereus matucanensis grows like a tree, branches out from the base in particular and reaches heights of growth of up to 6 metres.

The primrose, angular, flattened and slightly twisted brown spines later turn gray and have a darker tip.

The narrow, funnel-shaped, white flowers stand out horizontally or are erect.

[3] Armatocereus matucanensis is found in Ecuador in the province of Loja and the Peruvian region of Lima.

A nomenclature synonym is Lemaireocereus matucanensis (Backeb.