Echinopsis (Zuccarini 1837) is a large genus of cacti native to South America. The 128 species range from large and treelike types to small globose cacti.
The name derives from echinos hedgehog or sea urchin, and opsis appearance, a reference to these plants' dense coverings of spines.
Studies in the 1970s and 1980s resulted in several formerly separate genera being absorbed into Echinopsis:
Helianthocereus
Hymenorebutia
Pseudolobivia
Soehrensia
Trichocereus Riccobono
In addition, some have proposed merging Lobivia and Rebutia.
Species
Echinopsis adolfofriedrichii Moser
Echinopsis ancistrophora Spegazzini
Echinopsis angelesii R. Kiesling
Echinopsis antezanae (Cardenas) H. Friedrich & G.D. Rowley
Echinopsis arboricola (Kimnach) Mottram
Echinopsis arebaloi Cardenas 1956
Echinopsis atacamensis Cardon (Philippi) H. Friedrich & G.D. Rowley
Echinopsis aurea golden cob Britton & Rose
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Reference
Edward F. Anderson, The Cactus Family (Timber Press, 2001), pp. 255-286
Trichocereus cacti grow in an area not that far from the equator and consequently are not used to the duration of light found in more temperate summers.
Trichocereus cacti may receive too much light in temperate zones when placed in a full sun position particularly at high elevations, in these cases they should be placed in partial sun locations.
In nature the Trichocereus cacti grow in a soil rich in trace elements such as calcium, copper, iron, manganese and magnesium many of which play key roles in enzymatic pathways and function, thus these trace elements can be important factors in alkaloid biosynthesis.
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