1. Glabrous or pubescent evergreen shrub or tree of the genus Salvadora; twigs are fibrous and in some parts of the world are bound together in clusters and used as a toothbrush; shoots are used as camel fodder; plant ash provides salt
   "The mustard tree serves multiple purposes in traditional communities";
   - toothbrush tree, Salvadora persica
    
2. Evergreen South American shrub naturalized in United States; occasionally responsible for poisoning livestock
   "Farmers carefully removed mustard trees from their pastures";
   - tree tobacco, Nicotiana glauca

Derived forms: mustard trees

Type of: fruit tree, tobacco, tobacco plant

Part of: genus Salvadora, Salvadora

Encyclopedia: Mustard tree