Mimulus

Mimulus /ˈmɪmjuːləs/ is a diverse plant genus, the monkey-flowers and musk-flowers. The about 150 species are currently placed in the family Phrymaceae. The genus had traditionally been placed in Scrophulariaceae. The removal of Mimulus from that family has been supported by studies of chloroplast DNA first published in the mid-1990s. Multiple studies of chloroplast DNA and two regions of nuclear rDNA suggest that the genera Phryma, Berendtiella, Hemichaena, Leucocarpus, Microcarpeae, Peplidium, Glossostigma, and Elacholoma are all derived from within Mimulus and would need to be rearranged.

It is recognized that there are two large groups of Mimulus species, with the largest group of species in western North America, and a second group with center of diversity in Australia. A few species also extend into eastern North America, eastern Asia and southern Africa. This enlarged group is a part of the newly redefined Phrymaceae.

Characteristics

Most of the species are annuals or herbaceous perennials, but a few species are subshrubs with woody stems; these are treated in the section Diplacus. Diplacus is clearly derived from within Mimulus s.l. and was not usually considered to be generically distinct. Hence, it would not be treated as a genus separate from Mimulus now, though it might become a section of a yet-to-be defined split from Mimulus s.str.. A large number of the species grow in moist to wet soils with some growing even in shallow water. Some species produce copious amounts of aromatic compounds, giving them a musky odor (hence "musk-flowers").