Alliaria petiolata (Alliaria officinalis)
The crushed leaves and stems of this invasive forest weed have a garlic-like odor when crushed.
Ha… read more
An erect stem rising from a rosette of basal leaves with a terminal cluster of small, white or green… read more
This is the only yellow-flowered mustard with completely smooth pinnately lobed leaves and long, cyl… read more
Weedy aromatic plant cultivated for its seeds.
Habit: introduced annual herb; spreading stems, some… read more
Brassica rapa (Brassica campestris)
A widely cultivated crop which is also a widespread weed, with yellow flowers, colonizing large area… read more
Low, fleshy, branching beach plant with pale lavender flowers.
Habit: native annual, biennial, or p… read more
Sprawling, much-branched plant forming clumps on the beach.
Habit: native, annual or perennial, sub… read more
Clumping succulent inhabitant of coastal areas.
Habit: introduced annual or short-lived perennial … read more
This white-flowered mustard differs from other members of the mustard family by its triangular-shape… read more
Small white flowers in clusters atop smooth, erect, usually unbranched stems.
Habit: native annual … read more
Cardamine concatenata (Dentaria laciniata)
Terminal clusters of white or pink flowers on an erect unbranched stem with deeply cleft leaves.
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This species of bitter-cress differs from all others by its simple leaves that are heart-shaped at t… read more
Cardamine diphylla (Dentaria diphylla)
An upright, 8-16 in. perennial with paired leaves, each dissected so deeply as to appear compound. … read more
An aggressive agricultural weed with flat white flower clusters above clasping toothed leaves at top… read more
Cardaria pubescens (Lepidium appelianum)
Introduced. A weed growing from an extensive system of underground runners; bears clusters of tiny w… read more
A stout, swollen, yellow-green stem resembling a yellow candle, sometimes branched to resemble a can… read more
Introduced. An upright-growing, hairy weed with feathery leaves; branches toward the tops of stems i… read more
Dimorphocarpa wislizeni (Dithyrea wislizeni)
A grayish, hairy plant, either branched or unbranched, with erect, almost vertical, leaves and white… read more
Draba breweri var. cana (Draba lanceolata, Draba cana, Draba stylaris)
Small white flowers in open racemes growing from densely velvety, grayish, basal rosettes.
Habit: n… read more
A small, grayish, hairy, densely tufted plant with basal leaves and racemes of small yellow flowers … read more
A small, inconspicuous plant with minute white flowers on leafless stalks above a tiny basal rosette… read more
Contra Costa Wallflower
Erysimum angustatum (Erysimum capitatum var. angustatum)
An erect, coarse-stemmed, biennial herb in the mustard family.
Habit: native perennial herb; multip… read more
Erysimum capitatum (Erysimum asperum)
Rough, hairy stems, sparsely branched above or unbranched, support conspicuous bright yellow or oran… read more
A low plant with several short stems growing from tufts of basal leaves and bearing yellow or yellow… read more
A low, succulent plant with dense clusters of bright yellow flower, this plant is rare and found onl… read more
Habit: introduced biennial or short-lived perennial herb; multiple upright hairy stems rise from thi… read more
A tiny plant with a single minute white flower on each stem.
Habit: native annual herb; many thin,… read more
Introduced; invasive. A shrubby, herbaceous plant bearing clusters of bright yellow flowers at the e… read more
Several stems, brittle at joints, lying on ground with dense short racemes of yellow flowers turning… read more
Introduced. A dense, leafy, upright-growing plant topped with crowded clusters of small yellowish to… read more
A round plant formed by many slender branches, each branch ending in a short dense raceme of minute … read more
Short, flat, rounded fruits notched at the tip, very tiny white flowers with only 2 stamens, and too… read more
Yellow flowers in loose short racemes at stem ends of a low, rather tightly tufted, silvery-gray per… read more
Gordon's Bladderpod is a hairy annual with a silvery-gray appearance. Stems, up to 16 in. long, may… read more
Spreading Bladderpod or Cloth-of-gold is an upright or sprawling, hairy annual, to 20 in. Several s… read more
Erect, leafy plant with showy silvery seed pods resembling coins.
Habit: introduced annual or bien… read more
A grayish, hairy plant with clumps of leafy branched stems and racemes of white or lavender flowers … read more
Smooth, unbranched, sometimes prostrate stems rise or spread from tuft of grayish basal leaves and e… read more
Physaria acutifolia (Physaria australis)
A dwarf, silvery plant bearing dense racemes of yellow flowers.
Habit: native perennial herb; pros… read more
Introduced. A plant of the mustard family with bright yellow flower clusters at the tops of stems th… read more