Cereus pachyrrhizus
A little-known Cereus from Paraguay, named for its thick, tuberous root. It belongs to the low, slender-stemmed Cereus group of the Chaco and Paraguayan savannas, and needs strong sun, summer warmth, a dry winter and a very free-draining mix to protect the root.
Where it grows wild
Specific habitat data are lacking; by analogy with related low Cereus species it likely grows in open savanna, grassland or dry scrub on sandy soils, with stems among grasses and low shrubs and a storage root below ground.
No elevations recorded; Paraguay's lowlands lie mostly below 400 m and the climate point is at about 90 m.
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Profiles are drafts built from measured range and climate and from published sources; each section carries its own confidence in the app. Photo from Wikimedia Commons, used under its CC BY 4.0 licence, unmodified.