mustard family

noun
the plant family Cruciferae (or Brassicaceae), characterized by herbaceous plants having alternate leaves, acrid or pungent juice, clusters of four-petaled flowers, and fruit in the form of a two-parted capsule, and including broccoli, cabbage, candytuft, cauliflower, cress, mustard, radish, sweet alyssum, turnip, and wallflower.
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Encyclopedia Britannica
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mustard family

the mustard family, of the order Brassicales, a large assemblage of 338 genera and some 3,710 species of mostly herbaceous plants with peppery-flavoured leaves. The family includes many plants of economic importance that have been extensively altered and domesticated by humans. The members' flowers are in the form of a Greek cross, with four petals, usually white, yellow, or lavender, and an equal number of sepals. There are four long and two short stamens and a two-chambered ovary positioned above the other flower parts. The seeds are produced in podlike fruits and often have a mucilaginous coating that swells when wetted.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
The cultivated vegetables of the mustard family furnish a large part of the salad greens, leafy foods and root crops in our diet.
Awlwort is a member of the mustard family and produces the oblong seedpods that are characteristic of that family.
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