Taxon Report

Diplacus johnstonii (A.L. Grant) G.L. Nesom

Johnston's monkeyflower

Print Report


Taxon Summary

Diplacus johnstonii, commonly known as Johnston's monkeyflower, is a annual herb in the Phrymaceae that is found only in California. It occurs within Lower montane coniferous forest (disturbed areas, gravelly, roadsides, rocky, and scree), growing at elevations from 975 to 2920 meters. Diplacus johnstonii is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

  Classification
Scientific Name:
 Diplacus johnstonii (A.L. Grant) G.L. Nesom
Common Name:
 Johnston's monkeyflower
Family: Phrymaceae
Element Code: PDSCR1B1H0
USDA Plants Symbol:
Synonyms/Other Names:
  • Mimulus johnstonii

Ecology and Life History
Lifeform: annual herb
Blooming Period: May-Aug May-Aug
Elevation: 975-2920 (3200-9580)
General Habitats: Lower montane coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status
CA Rare Plant Rank: 4.3
Global Rank: G4
State Rank:
 S4
State List: None
Fed List: None
Other Status: SB_CalBG/RSABG; SB_SBBG
CRPR Changes:

Occurrence Data from the CNDDB
Total Occurrences: 0
Element Occurrence Ranks:
   Excellent (A) 0
   Good (B) 0
   Fair (C) 0
   Poor (D) 0
   None (X) 0
   Unknown (U) 0

Location
California Endemic:  True
California Counties and Islands: Name (Code)
Los Angeles (LAX), Riverside (RIV), San Bernardino (SBD), Santa Barbara (SBA), Ventura (VEN)
Quads: Name (Quad Code)
Apache Canyon (3411973), Cajon (3411734), Chilao Flat (3411831), Condor Peak (3411832), Crystal Lake (3411737), Cucamonga Peak (3411725), Cuyama Peak (3411974), Fawnskin (3411638), Fifteenmile Valley (3411741), Forest Falls (3411618), Juniper Hills (3411748), Littlerock (3411758), Mescal Creek (3411746), Mount San Antonio (3411736), Mt. Wilson (3411821), Pacifico Mountain (3411841), Phelan (3411745), San Rafael Mtn. (3411967), Sunland (3411833), Telegraph Peak (3411735), Valyermo (3411747), Waterman Mtn. (3411738), White Water (3311686)

Threat List Data from the CNDDB

Threat List Total: 0
EOs with Threat Listed: Total EOs % of EOs
0 0 %

Notes
 Known only from the San Gabriel and San Bernardino Mtns. Hybridizes with D. constrictus in the Western Transverse Ranges. See Annals of the Missouri Botanical Garden 11:280 (1924) for original description, Systematic Botany Monographs 75:99 (2005) for taxonomic treatment, and Phytoneuron 2012-39:1-60 (2012) for revised nomenclature..
Threats:
Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 13 February 2025].