The name would be Endiandra palmerstonii. Family: Lauracae.
Juglans nigra is the scientific name for a walnut tree
A white walnut tree is commonly known as a butternut tree. Its scientific name is Juglans cinerea.
Juglans regia
Walnut is the common name, Juglans is the scientific name, see link below.
Juglans regia
The name would be Juglans regia. Family: Juglandaceae.
The name would be Lovoa trichilioides. Family: Meliaceae.
Family : Arecaceae (=Palmaceae) Genus : Areca Species : catechu
Juglansnigra, I found it on http://faculty.ucc.edu/biology-ombrello/POW/black_walnut.htm
If you mean the Butternut tree ther are two. One is Juglans cinerea of the walnut family. There is also Caryocar nuciferum a Brazillian tree with hard durable timber.
The scientific name would be Aleurites trisperma.
The accepted scientific name is Laothoe juglandis.