First, apologies for adding to the mess of taxon changes on these observations.

iNaturalist now follows Plants of the World Online (POWO) for vascular plant taxonomy. POWO accepts several taxa as species which were formerly recognized as infraspecific to Mimulus aurantiacus. They are now in the genus Diplacus. iNaturalist recently moved these Mimulus aurantiacus taxa to Diplacus, but this swap that merged Mimulus aurantiacus into Diplacus aurantiacus should have been a split instead.* Since it's too late to safely reverse that taxon change, we'll have to do a second one.

The taxon being split, taxon ID 161938 (Diplacus aurantiacus) is the sensu lato version of Mimulus aurantiacus, and taxon ID 777371 (also D. aurantiacus) is the sensu stricto, new version. Taxa that were formerly infraspecific to M. aurantiacus should be identified as their new Diplacus species instead. For example, Mimulus aurantiacus var. aridus should now be identified as Diplacus aridus, not Diplacus aurantiacus.

Mimulus aurantiacus -----split into---->
Diplacus aurantiacus
D. aridus (formerly M. aurantiacus var. aridus)
D. × australis (M. aurantiacus subsp. australis)
D. grandiflorus (M. aurantiacus var. grandiflorus)
D. × lompocensis (M. aurantiacus subsp. lompocensis)
D. parviflorus (M. aurantiacus var. parviflorus)
D. puniceus (M. aurantiacus var. puniceus)
D. longiflorus (M. aurantiacus var. pubescens)

The output taxa in the taxon change here have been atlased, but unfortunately many of these species/hybrids have overlapping ranges, so IDs will mostly not be reassigned automatically. In most cases, the ID will be set as "Diplacus sect. Diplacus," the section within the genus to which these all belong. The newly added section Diplacus IDs should not be in disagreement with any IDs that have been added since the original swap from M. aurantiacus to D. aurantiacus.

Ranges for the atlases were taken from Tulig & Nesom 2012 and Nesom 2013. Recognizing that species ranges are never perfect, some taxa may be given incorrect IDs as a result of this swap. Please be vigilant when identifying observations that fall within this section. In addition, the ranges are based on naturalized populatons, not cultivated organisms, so observations of captive specimens will need to be carefully reviewed. When in doubt, we now have the option to ID to section, rather than back up all the way to genus.

To read more about the taxonomy of this section of Diplacus, including a key to identification, please check out this paper: http://www.phytoneuron.net/PhytoN-sectDiplacus.pdf

Links to Help Reassign IDs:
-Identify rank=section Diplacus observations
-Identify captive observations

See previous discussion about this taxon split here:
https://www.inaturalist.org/posts/18699-diplacus-dilemma-in-california-area

* Plants of the World Online does not indicate whether an unaccepted synonym was split into 2 or more taxa, it simply directs the user toward one of the potentially many taxa into which it was split.