Opaca basically means "shady" in Latin and is named so because it grows quite well in the shade.
An American holly is a species of holly, Latin name Ilex opaca, native to the eastern United States.
ilex opaca
The scientific or taxonomic name would be Ilex opaca.
ILEX
I'm pretty sure its the pine tree Ilex aquifolium is the Latin name for the European holly.
A yerba is a species of holly, Latin name Ilex paraguariensis, which is native to southern South America.
google is good for this: http://images.google.com/images?um=1&hl=en&q=American+Holly+(Ilex+opaca)&btnG=Search+Images
"Opaca" is a specific epithet used in Latin botanical nomenclature to denote a species with characteristics like being dark, opaque, or with little translucency. It often indicates a plant or animal that has a dark or obscure appearance.
A yerba mate is a species of holly, Latin name Ilex paraguariensis, native to southern South America.
The name would be Ilex spp.
There are over 400 different species of holly, belonging to the genus Ilex. These species vary widely in appearance, habitat, and climate preferences, with some being popular for ornamental use in gardens and landscapes. The most well-known is the American holly (Ilex opaca), known for its glossy leaves and bright red berries. Other varieties include English holly (Ilex aquifolium) and winterberry (Ilex verticillata), each offering unique characteristics.
Empis opaca was created in 1804.