Yellow Toadflax
Linaria vulgaris

Yellow Toadflax adult
This perennial weed grows to two feet tall.
Yellow Toadflax rosette
Leaves are two and one-half inches in length, narrow, and pointed.
Yellow Toadflax infestation
Yellow toadflax came from Eurasia. It is an aggressive invader of rangeland, roadsides, field edges, and waste areas. An extensive root system makes this weed difficult to control. It reproduces by seeds and roots.
Yellow Toadflax flower
Flowers are about one inch long, yellow with an orange throat, and have long tails. They look similar to snap dragon flowers. Bloom is in late spring into summer.