a genus of herbs of the family Scrophulariaceae with brightly colored irregular flowers

Antirrhinum is a genus of plants that used to be the family Scrophulariaceae, more commonly known as snapdragons from the flowers' fancied resemblance to the face of a dragon that opens and closes its mouth when properly squeezed (thus the 'snap'). Study of DNA sequences have led to the inclusion of Antirrhinum in a vastly enlarged family Plantaginaceae.