The Mission of the Yellowstone County Weed Department is to assist the public, private, and other government agencies to manage and control existing noxious weed infestations as well as to prevent new invasive species from infesting Yellowstone County.

Purple MustardChorispora Tenella

Photo from The American Southwest

 

 

 

 

 

 

Photos from The American Southwest

Attribute	Information
Stem	1–5 dm, branched from near base
Leaves	Lanceolate to oblong to oblanceolate, up to 3 inches long, with wavy, shallowly lobed or toothed edges
Flower	Sepals erect, 6–8 mm, free but forming a tube; petals narrowly clawed, magenta
Habitat	Disturbed ground, roadsides, wasteland, washes, fields, pastures
Range	All the western states
Height	Between 4 and 15 inches
Season	March to June
Elevation	< 1300 m