"The kingdom of heaven is like to a grain of mustard seed, which a man took, and sowed in his field: Which indeed is the least of all seeds: but when it is grown, it is the greatest among herbs, and becometh a tree, so that the birds of the air come and lodge in the branches thereof."
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(Brassica nigra, Brassica alba, and Brassica juncea)
These yellow-flowered members of the cabbage family produce seeds that have been ground and used as a condiment for thousands of years.
White, black, or Indian, both seeds and leaves are pungent. Black mustard greens (often a weed in the U.S.) has medical applications: it's a valuable counter-irritant, either in liniment or plaster form (and I have strong memories of my grandmother applying these burning plasters to my chest to break up a cold); it's a stomach stimulant; and it's an emetic.
And what about the leaves of this plant? A wonderful leaf green, especially the Brassica juncea and Brassica campestris varietals.