Taxon Report

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

Santa Catalina Island monkeyflower

Print Report

Taxon Summary

Diplacus traskiae, commonly known as Santa Catalina Island monkeyflower, is a annual herb in the Phrymaceae that is found only in California. It occurs within Coastal scrub, growing at elevations from to meters. Diplacus traskiae is ranked 1A, Plants Presumed Extirpated in California and Either Rare or Extinct Elsewhere.

Classification


Scientific Name:	Diplacus traskiae (A.L. Grant) G.L. Nesom
Common Name:	Santa Catalina Island monkeyflower
Family:	Phrymaceae
Element Code:	PDSCR1B2P0
USDA Plants Symbol:
Synonyms/Other Names:	Mimulus traskiae

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Mar-Apr	Mar-Apr
Elevation:	- (-)
General Habitats:	Coastal scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1A
Global Rank:	GX
State Rank:	SX
State List:	None
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	1
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	1
Unknown (U)	0

Location


California Endemic: True
California Counties and Islands: Name (Code)
Los Angeles (LAX)
Quads: Name (Quad Code)
Santa Catalina East (3311833)*

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	1	100 %
Grazing	1	100%
Non-native animal impacts	1	100%

Notes



Known only from the type collection (in 1901) near Avalon; locality vague. Possibly extirpated by grazing. See Field Museum of Natural History 5:226 (1923) for original description, Phytoneuron* 2012-39:1-60 (2012) for revised nomenclature, and Phytoneuron 2013-66:1-8 (2013) for taxonomic treatment.*
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 24 October 2025].