Flowers in the phrymaceae
(lopseed) family have tubular calyces extending into five narrow, pointed lobes, and a corolla that is usually bilateral, opening to two lips, the upper two-lobed, the lower three-lobed. The corolla contains four stamens, in two pairs, plus one pistil. Plants range in size and growth form from herbs a few inches tall to woody shrubs many feet across. Leaves are generally simple, oppositely arranged, with entire or toothed margins, and no stipules. A few genera including mimulus were formerly part of the scrophulariaceae
family. 97 species are found in the US, in six genera.