Nuttallanthus canadensis (syn. Linaria canadensis (L.) Dumort., Antirrhinum canadense L.; blue toadflax, Canada toadflax, old-field toadflax) is a species of Nuttallanthus in the Plantaginaceae family, native to eastern North America from Ontario east to Nova Scotia and south to Texas and Florida.
It is an annual or biennial plant growing to 25–80 cm tall, with slender, erect flowering stems. The leaves are slender, 15–30 mm long and 1-2.5 mm broad. The flowers are purple to off-white, 10–15 mm long, appearing from mid spring to late summer. It typically grows in bare areas and grassland.
It is grown as an ornamental plant in its native area. It has been introduced to western North America and Europe, and is now locally naturalized, from Washington south to California, and also in Russia.
- "Nuttallanthus canadensis". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 19 January 2018.
- USDA Plants Profile: Nuttallanthus canadensis
- Missouriplants: Nuttallanthus canadensis
- Huxley, A, ed. (1992). New RHS Dictionary of Gardening. ISBN 0-333-47494-5
- Blanchan, Neltje (2002). Wild Flowers: An Aid to Knowledge of Our Wild Flowers and Their Insect Visitors. Project Gutenberg Literary Archive Foundation.
- NC State University: Linaria canadensis
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- Jepson Manual treatment: Linaria canadensis (Nuttallanthus canadensis)
- USDA Plants Profile for Nuttallanthus canadensis (Canada toadflax)
- Plants For A Future: Linaria canadensis
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