The Mustard Family is one of the easiest of all plant families to recognize because of the 4 distinct petals arranged to form a cross. This family is also known as Cruciferae because of this feature. There are 4 sepals and 6 stamens, two of which are shorter than the other four. The stem leaves are alternate and many species have basal rosettes. The mature seed pods (capsules) take several distinct shapes, but are always noticeable. They are usually needed if uncertain about which species is being examined.

This very large family contains a number of our common food plants-cabbage, turnip, radish, etc. There are 27 genera locally, a great many of them introduced weeds. Watercress and Sweet Alyssum have crept in from elsewhere. Even the abundant Wild Radish (Raphanus sativus) frequent in waste places and the Sea Rocket
(Cakile maritima) on the sandy beaches are immigrants. (Dale 79).

Upper Newport Bay species within the family:
Brassica rapa ssp. sylvestris
Brassica tournefortii
Lepidium nitidum var. nitidum #
Lepidium pinnatifidum
Capsella bursa-pastoris
Raphanus raphanistrum
Descurania pinnata ssp. menziesii #
Raphanus sativus
Lepidium didymum
Brassica geniculata
Brassica nigra
Cakile maritima
Cardamine oligosperma #
Diplotaxis muralis
Hutchinsia procumbens #
Lepidium lasiocarpum var. lasiocarpum #
Sisymbrium irio
Sisymbrium orientale
Sisymbrium altissimum
Raphanus raphanistrum x sativus
Nasturtium officinale
Matthiola incana
Lobularia maritima
Lepidium latifolium