any herbaceous plant of the genus Antirrhinum (order Scrophulariales, family Plantaginacea, also known as Antirrhinaceae; formerly in the family Scrophulariaceae), of which there are about 20 species native to western North America and the western Mediterranean region. The flowers are tubular, bilaterally symmetrical, and usually large with a closed, liplike mouth that excludes most insects but can be forced open by strong bees, the main pollinators.