Cleistocactus viridiflorus is a species of columnar cacti in the genus Cleistocactus. Description Cleistocactus viridiflorus grows to a height of , with a diameter of , and has green stems that branch at the base. The plant features 14 to 19 slightly wavy ribs lined with densely spaced areoles. From these areoles, prominent, needle-like central spines emerge—about 10 mm long and ranging in color from whitish yellow to yellow. Around 20 radial spines, white and slightly protruding, measure between 5 and 7 mm.
Its flowers are straight and tubular, measuring 3 to 3.5 cm in length. They are colored from green to white or yellow-green and tend to barely open, as is typical for many species in the genus. The fruits are light green and 1.5 cm wide.
Distribution Cleistocactus viridiflorus is a shrub-like cactus native to Bolivia's La Paz department, typically found growing along with trees and shrubs at elevations between 1,400 and 3,200 meters.
Taxonomy Cleistocactus viridiflorus was first described by the German botanist Curt Backeberg in 1963, published in "Descriptiones Cactacearum Novarum 3: 5."
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