The
genus name "Echinopsis" derives from the Greek word
“echinos (εχινος) ” meaning "porcupine or hedgehog", "sea urchin”
and the word "opsis (οφις)" meaning “appearance, seeing,
like”
referring
to the spines that cover the plant as it looks like a rolled up
hedgehog.
( The
genus name implies:"like a porcupine").