Nigeria

Nigeria is a major producer of Arabic gum from Acacias. Nigeria has three grades of Gum Arabic namely:
 
Senegalia senegal (grade 1) 
Senegalia seyal (Grade 2) and 
Combretum (Grade 3).

see: http://www.export-nigeria.com/2009/12/export-product-profile-gum-arabic.html

Also accepted under Grade 1 is Senegalia laeta, a hybrid between S. senegal and S. mellifera

Other Acacias occuring in Nigeria are

Senegalia ataxacantha

Acacia ehrenbergiana

Acacai hockii

S. mellifera

Vachelliaa nilotica

Acacia tortilis

Faidherbia albida

as well as imported species like A. auriculiformis