Cleistocactus Lem.
Suom.: hopeapylväskaktus.
Sven.: silverpelare.
Bot. syn.: Borzicactus Riccob.

Cleistocactus baumannii

Cleistocactus baumannii (Lem.) Lem.
Bot. syn.: Cereus baumannii Lem.

Cleistocactus samaipatanus

Cleistocactus samaipatanus (Card.) D.R. Hunt.
Suom.: bolivianpylväskaktus.
Sven.: rubinkaktus, gullsvanskaktus.
Bot. syn.: Akersia roseiflora Buining, Bolivicereus brevicaulis F. Ritter, Bolivicereus samaipatanus Cardenas, Borzicactus samaipatanus (Card.) Kimnach.

Cleistocactus smaragdiflorus

Cleistocactus smaragdiflorus (Web.) Britt. & Rose.
Bot. syn.: Cereus smaragdiflorus F.A.C. Weber.

Cleistocactus straussii

Cleistocactus straussii (Heese) Backeb.
Bot. syn.: Pilocereus straussii Heese.

I have no articles for this botanical term, but there might be some for the next level down (if found).