The genus Euphorbia is a huge collection of plants -- many of them are commonly called spurges, but poinsettias also belong in the genus, along with many other plants with various common names.
Euphorbia is the scientific name.
Specifically, the word is the name of a genus of plants. It honors the Greek physician Euphorbus for whom a cactus-like spurge was named in 12 B.C. The plant in question is known by the common name spurge.
The scientific or taxonomic name would be Euphorbia tirucalli.
Euphorbia Obesa
Scientific name of tawa-tawa plant: Euphorbia hirta
The scientific or taxonomic name would be Euphorbia lathyris.
The scientific or taxonomic name would be Euphorbia maculata.
The scientific or taxonomic name would be Euphorbia royleana.
The scientific or taxonomic name would be Euphorbia myrsinites.
The scientific or taxonomic name would be Euphorbia resinifera.
The scientific or taxonomic name would be Euphorbia tirucalli.
The scientific or taxonomic name would be Euphorbia pulcherrima.
The scientific or taxonomic name would be Euphorbia maculata.
The scientific or taxonomic name would be Euphorbia esula.