This family, traditionally accommodated in Scrophulariaceae, was transferred to Phrymaceae (APG III 2009) as a result of molecular phylogenetic studies. However, more recent studies by Reveal (2011) tend to accept Mazaceae as a family of its own (see also APG IV 2016). According to Barker & al. (2012) Mazaceae, as described by Reveal l.c., includes two genera: Mazus Lour. and Lancea J.D. Hook. & T. Thomson. Plants of the latter two genera, however, have bilamellate, sensitive stigmas like the Phrymaceae and Reveal's brief description of Mazaceae does not distinguish it morphologically from Phrymaceae. However, although these authors did not find apomorphies to distinguish Mazaceae from Phrymaceae, it seemed likely that further morphological studies will corroborate the distinction between Mazaceae and Phrymaceae. Both families are therefore accepted as separate entities in this account.
APG III (2009) An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants. APG III. Bot. J. Linn. Soc. 161(2): 105-121.
APG IV (2016) An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG IV. Bot. J. Linn. Soc. [available online at: http://onlinelibrary.wiley.com/doi/10.1111/boj.12385/full]
Argue C.L. (1984) Pollen morphology in Dodartia, Lancea, Leucocarpus and Mazus and an analysis of pollen morphotypes in the Mimuleae (Scrophulariaceae). Canad. J. Bot. 62(6): 1287-1297.
Barker W.R., Nesom G.L., Beardsley P.M. & Fraga N.S. (2012) A taxonomic conspectus of Phrymaceae: A narrowed circumscription for Mimulus, new and resurrected genera, and new names and combinations. Phytoneuron 2012-39: 1-60. [available online at: http://www.phytoneuron.net/PhytoN-Phrymaceae.pdf]
Reveal J.L. (2011) Summary of recent systems of angiosperm classification. Kew Bull. 66: 5-48.