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.

Yellow ToadflaxLinaira vularis

Photo from Weeds of the West, revised edition

Toxic

Rosette

Stem

Leaf

Bloom

Seed

Video Supplied By Ravalli County Weed District

Attribute	Description
Toxicity	Toxic. Suspected to be toxic to some animals if large quantities are ingested.
Growth Habit	Perennial, often over 3 ft. tall.
Leaves	Long and narrow, numerous, pale green, smooth and pointed, attached directly to the stem.
Stem	Smooth, erect and sometimes branched.
Flower	Snapdragon type, 1 to 1½ inches long with spur, bright yellow with deep orange center.
Roots	Woody, vigorous, well branched with many laterals.
Seeds	Round, ½ inch in diameter, dark brown to black with a papery circular wing.
Reproduction	Reproduces by seed and underground rootstocks.
Habitat	Yellow Toadflax is an aggressive invader of rangelands, displacing desirable grasses. It can also be found along roadsides, waste areas, and cultivated fields.
Biological Controls	—
Herbicides	Tordon.