Photo from Weeds of the West, revised ed.
Toxcity: 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 1 ½ 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.