Linaria dalmatica (Dalmatian Toadflax)

Plant Info

Also known as:
Genus:	Linaria
Family:	Scrophulariaceae (Figwort)
Life cycle:	perennial
Origin:	East Mediterranean
Status:	Early Detection weed, MDA
Habitat:	sun; dry fields, roadsides, disturbed soil
Bloom season:	summer to early fall
Plant height:	1 to 3 feet
USDA PLANTS database:	Minnesota county distribution map

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Detailed Information

Flower:

Irregular flowers about 1½ inches long in a spike-like raceme at the top of the plant. Flowers are bright yellow with two lips, sport an orange bearded (hairy) throat and have a long spur hanging down at the base that holds nectar. They look very similar in form to the common garden shapdragon though the two species are not closely related.

Leaves and stem:

Leaves are up to 2 inches long and 1½ inches wide, toothless, have a pointed tip, are broad at the base, alternately attached and mostly clasp the main stem. Leaves and stems are smooth with a waxy layer (cuticle) that gives them a bluish cast. The stems are stout and branched in the upper part of the plant.

Notes:

The flowers of Dalmatian Toadflax are much like Butter and Eggs (L. vulgaris) but the latter has very different leaves—long and very narrow. While Butter and Eggs is fairly widespread in Minnesota, Dalmatian toadflax is just showing up now. Likely originally introduced into North America by gardeners, it is now a highly problematic invasive species throughout the arid western US, spreading aggressively by both seeds and robust underground root stalks. While it should be controlled as soon as possible whereever and whenever it is found, the waxy cuticle makes it highly resistent to chemical control and its deep underground roots make hand pulling nearly worthless.

Early detection is the key to preventing this from getting a real foothold. The Minnesota Dept. of Agriculture (MDA) is targeting this species, among others, and would like to take quick action against it. See the MDA Dalmatian Toadflax fact sheet for more information. If you think you see this plant somewhere in MN please either contact the MDA or post a comment below. Thank you for helping to stop this pest in its tracks!

More photos

• Dalmatian Toadflax plants
• more plants

Photos courtesy Peter M. Dziuk, taken along Cr 8, just NW of Grand Marais, MN in Cook County

Comments

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