Taxon Report

Erythranthe marmorata (Greene) G.L. Nesom

Stanislaus monkeyflower

Print Report

Taxon Summary

Erythranthe marmorata, commonly known as Stanislaus monkeyflower, is a annual herb in the Phrymaceae that is found only in California. It occurs within Cismontane woodland, and Lower montane coniferous forest, growing at elevations from 100 to 900 meters. Erythranthe marmorata is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Erythranthe marmorata (Greene) G.L. Nesom
Common Name:	Stanislaus monkeyflower
Family:	Phrymaceae
Element Code:	PDPHR01130
USDA Plants Symbol:
Synonyms/Other Names:	Mimulus whipplei

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Mar-May	Mar-May
Elevation:	100-900 (330-2955)
General Habitats:	Cismontane woodland, Lower montane coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G2?
State Rank:	S2?
State List:	None
Fed List:	None
Other Status:	BLM_S
CRPR Changes:	changed from 1A to 1B.1 on 2016-08-29

Occurrence Data from the CNDDB


Total Occurrences:	10
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	10

Location


California Endemic: True
California Counties and Islands: Name (Code)
Amador (AMA), Calaveras (CAL), Fresno (FRE), Stanislaus (STA), Tuolumne (TUO)
Quads: Name (Quad Code)
Columbia (3812014), Columbia Se (3812013), Ione (3812038), Keystone (3712075), Knights Ferry (3712076), Mokelumne Hill (3812036), Murphys (3812024), Patterson Mtn. (3611981), Pine Grove (3812046), Sonora (3712084), West Point (3812045)

Threat List Data from the CNDDB


Threat List Total:	1
EOs with Threat Listed:	Total EOs	% of EOs
	1	10 %
Grazing	1	10%

Notes



Previously CRPR 1A (as Mimulus whipplei); M. whipplei was known only from the type collection, which was examined and attributed to E. marmorata by G. Nesom in 2012. See Erythea 3(5): 73 (1895) for original description, Phytoneuron 2012-39: 1-60 (2012) for revised nomenclature, Phytoneuron 40: 1-123 (2012) for taxonomic treatment, and Phytoneuron 2013-67: 1-15 (2013) for new distribution records.
Threats:

Taxonomy:
Similar to E. microphylla, E. pardalis, and E. nasuta.

Selected References

CRPR List Change on 2016-08-29

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 7 December 2025].