Weed of the Week

August 21st 2006

Dalmatian Toadflax   Linaria genistifolia ssp. dalmatica, (L.)

               

 

Characteristics:

Family: Scrophulariaceae (Figwort)

Origin: Europe

Description:

• Perennial
• Extensive creeping root network
• Reproduces by seeds and root stock

Stems:

• Single to multiple branching, erect stems
• Grows up to 4 feet tall

Flowers:

• Two lipped, yellow flowers with orange centers
• 3/4 inch-1 1/2 inches diameter terminating in a spur
• Resembles the flowers of snapdragons
• Bloom occurs June-August.  If conditions are favorable, may bloom several times in a season
• Prolific amounts of black seeds are produced in a 2-celled capsule

Leaves:

• Leaves are heart shaped and clasp the stem
• Waxy in texture

Location:

    Dalmatian Toadflax is becoming a widespread problem in rangeland areas in the west.  It is acclimated to arid conditions.  Waxy leaves inhibit herbicide penetration and hand-pulling only stimulates increase growth.  Dalmatian Toadflax was introduced as an ornamental like, like many other weeds escaped into natural areas where it out - competes native species.

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