Nemesia caerulea (USA) ?

Nemesia caerulea is a blue- to purple- flowered herbaceous perennial member of the Plantaginaceae family.^[1] The plant is native to the Cape Floristic Province of southwestern South Africa, where it grows at low elevations on fully exposed north-facing and northwest-facing slopes in association with other native grasses and herbs.^[2] Its chromosome number is 2n=18.^[3]

It produces many small flowers in shades of pink, blue and white (the Latin caerulea means “dark blue”).^[4] The flowers are two-lipped, the upper lip with four lobes and the lower lip with two lobes. In cultivation the two lips are often different colours.^[5]

In temperate regions it is usually grown as an annual.

References:

The Plant List (unresolved) Missouri botanical garden  Wikipedia