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Family: Cactaceae 

 Cleistocactus strausii
Author:  Curt Backeberg 1913
Family:  Cactaceae
Habitat:  Bolivia and Argentina, between 3,000 and 4,000m height.
Soil:  Grit
Water:  Medium-Maximum
Sun:  Maximum
Thickness:  6 centimetres
Height:  3 meters
Flower:  Deep red
Reproduction:  Seeds/Cuttings
Pop names:  Silver Torch
Synonyms:  Pilocereus strausii Heese 1907. Denmoza strausii, Cereus strausii, Borzicactus strausii

The flowers won't open.

   This member of the Cactaceae family was described by Curt Backeberg in 1913. It is found in the mountains of Bolivia and Argentina, growing in extreme well-drained soil with quiet some water in summer, and none in winter. Lots of sun, but not too high temperatures, can even stand 10 C frost! It will grow to six centimetres in diameter and three meters high. The flowers are deep red, and won't open. It can be reproduced both by seeds and with some luck; Cuttings. 

SubFamily: Cactoideae, Tribe: Trichocereeae

Cleistois the  Greek words Kleistos, meaning closed (the flowers don't open), and Kaktos means thistle.
strausii - For Richart Strauss.