mustard tree

Noun mustard tree has 2 senses

• mustard tree(n = noun.plant) nicotiana glauca, tree tobacco - evergreen South American shrub naturalized in United States; occasionally responsible for poisoning livestock; Array
is a kind of tobacco, tobacco plant

• mustard tree(n = noun.plant) salvadora persica, toothbrush tree - 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; Array
is a member of genus salvadora, salvadora
is a kind of fruit tree