Dalmatian Toadflax
Linaria genistifolia
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Dalmatian toadflax is a perennial, up to 3' tall, reproducing by seed and underground root stalks. Leaves are dense, alternate, entire, upper leaves are conspicuously broad-based. Flowers are borne in axils of upper leaves and are 2-lipped, 3/4 to 1 1/2 inches long with a long spur, yellow with an orange, bearded throat. Fruit is a 2-celled capsule with many irregularly angled seeds. Flowers appear mid-summer and continue to flower until early fall. Leaves individually clasp the stem.
It is aggressive and can be found along roadsides and on rangeland where it can become a serious problem by crowding out desirable forage. An extensive and deep root system along with a waxy leaf make this an extremely difficult plant to control.