Toadflax really does look like baby snapdragon, which is its other common name. The tiny, half inch wide flowers are similarly bisymmetrical, and arranged in small trusses, although the diminutive leaves are distinctively narrow.
Common toadflax, Linaria maroccana, which is actually less common than the name implies, gets about one and a half to two feet tall and about half a foot wide. Two toned flowers bloom in summer in shades of pink, purplish pink, purple, blue, very pale yellow or red with yellow. ‘Northern Lights’ adds shades and bicolor combinations of yellow, orange and red to the mix. The more common ‘Fantasy Hybrids’ get only about half as tall and perhaps slightly wider, with earlier and slightly larger flowers in shades of yellow, blue, pink and bright pink, as well as white, mostly with slightly yellow throats.
Toadflax is a summer annual, but does not like to be too exposed to roasting heat and glare. If grown from seed, it should be sown as soon as possible after the last frost to get an early start.