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Linaria vulgaris  P. Mill.
Riley County, Kansas
Height: 12-30 inches
Family: Scrophulariaceae - Figwort Family
Flowering Period:   June, July, August
Also Called: Butter-and-eggs, wild snapdragon.
Stems: Erect or ascending, 1 to several, simple to branched.
Leaves: Alternate or nearly opposite below, numerous, crowded, linear, 1 to 2 inches long, 1/12 to 1/4 inch wide, pale green, glabrous, narrowed to a stalk-like base.
Inflorescences: Raceme, congested, spike-like, terminal; bracts alternate, reduced.
Flowers: Short-stalked, calyx deeply 5-parted; segments lanceolate, nearly equal; corolla .8 to 1.6 inch long including spur, 2-lipped, bright yellow with orange beard on lower lip at throat; upper lip 2-lobed, 1/3 to 1/2 inch long; lower lip 3-lobed, 1/4 to 1/3 inch long; stamens 4.
Fruits: Capsule, nearly spherical, 1/5 to 1/3 inch long, 2-celled; seeds numerous, disc-shaped with wings.
Habitat: Open disturbed sites, roadsides, waste areas, and rangeland.
Distribution: Scattered throughout Kansas
Origin: Native of Europe and Asia. Introduced as an ornamental in North America in the 1800's and now naturalized.
Toxicity: Suspected to be mildly poisonous to livestock.
Comments: Strong-scented. Sometimes grown in flower gardens, but can escape and spread aggressively. In rangeland, it can displace desirable grasses. Yellow toadflax is difficult to eradicate, due to its extensive root system.

Yellow toadflax linflorescence
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Riley County, Kansas
Yellow toadflax leaves
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Riley County, Kansas
Yellow toadflax
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Riley County, Kansas