This member of the
Cactaceae family was
given this name
by Michael Kiessling in 2000. It is found
north of the Argentine city of San Juan. It grows in grit with
little water and lots of sun. The flowers are yellow to
brown-orange. The root will get up to five centimetres in diameter
and fifteen centimetres long. The whole plant will get fifteen
The genus is named for the
Ancient Greek city of Opus, where, according to Theophrastus,
an edible plant grew and could be propagated by rooting its leaves.
Surely not this genera. The species name after Dr. Silvio Megloni,
an Argentinean cactus collector.