| toothbrush tree | (n) 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, Syn. mustard tree, Salvadora persica |
| tree tobacco | (n) evergreen South American shrub naturalized in United States; occasionally responsible for poisoning livestock, Syn. mustard tree, Nicotiana glauca |