Yellow toadflax a native of Eurasia is a perennial that grows 1 to 2 feet (0.3-0.6 m) tall. It has several main stems with numerous leaves.
Leaves are pale green, narrow, pointed at both ends and 2 1/2 (6 cm) inches or longer.
The attractive yellow flowers are 1 inch (2.54 cm) long with a bearded, orange throat and spur-like appendages. Several form near the ends of the stalk.
The fruit is round, 1/4 inch (5 to 6 mm) in diameter, brown, 2-celled, with many seeds. The seeds are dark brown to black, 1/12 inch (1 to 2 mm) in diameter and they have a flattened, papery circular wing. Yellow toadflax reproduces by seed and underground roots. Along with the seed produced, the extensive root system makes this plant difficult to control.
Yellow toadflax, was introduced into the United States in the mid-eighteen eighties as an ornamental. This creeping perennial is an aggressive invader of wildlands where it displaces desirable grasses. It is also found along roadsides, waste places, and cultivated fields.
Narrow leaves that are pointed at both ends are less than 2 1/2 inches long and are individually connected to the central stem.
Yellow flowers have an orange throat and spur-like appendages.