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Austrian Fieldcress Rorippa austriaca


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Austrian Fieldcress
© Steve Schoenig/Senior Environmental Research Scientist, Integrated Pest Control Branch, CA Dept. of Food and Ag.

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Family: Brassicaceae, Mustard view all from this family

Description Introduced. A plant of the mustard family with bright yellow flower clusters at the tops of stems that grow from a basal rosette of leaves.
Flowers: small, 4-petaled, in loose, branched clusters.
Leaves: grayish- to bluish-green; basal leaves irregularly toothed; stem leaves alternate, stalkless, clasp stem, often toothed, oblong, 1-4" (3-10 cm) long.
Height: to 39" (1 m).

Flower June-August.

Habitat Disturbed areas, including agricultural fields and roadsides; often on wet sites.

Range Native of Eurasia; introduced and becoming established in areas of North America, mostly in the north.

Discussion Austrian Fieldcress is considered a noxious weed in the states of Alaska, Arizona, California, Nevada, and Washington, and is also established in a number of other states. It spreads mainly by a creeping root system and forms dense monocultures.