Taxon Report

Erythronium tuolumnense Appleg.

Tuolumne fawn lily

Print Report

Species Description:
Erythronium tuolumnense, commonly known as Tuolumne fawn lily, is a perennial bulbiferous herb in the Liliaceae that is found only in California. It occurs within Broadleafed upland forest, Chaparral, Cismontane woodland, and Lower montane coniferous forest, growing at elevations from 510 to 1365 meters. Erythronium tuolumnense is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Erythronium tuolumnense Appleg.
Common Name:	Tuolumne fawn lily
Family:	Liliaceae
Element Code:	PMLIL0U0H0
USDA Plants Symbol:	ERTU
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial bulbiferous herb
Blooming Period: Mar-Jun	Mar-Jun
Elevation:	510-1365 (1675-4480)
General Habitats:	Broadleafed upland forest, Chaparral, Cismontane woodland, Lower montane coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G2G3
State Rank:	S2S3
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_CalBG/RSABG; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	35
Element Occurrence Ranks:
Excellent (A)	6
Good (B)	9
Fair (C)	3
Poor (D)	0
None (X)	0
Unknown (U)	17

Location


California Endemic: True
California Counties and Islands: Name (Code)
Tuolumne (TUO)
Quads: Name (Quad Code)
Columbia (3812014), Columbia Se (3812013), Crandall Peak (3812022), Duckwall Mtn. (3712081), Standard (3712083), Tuolumne (3712082), Twain Harte (3812012)

Threat List Data from the CNDDB


Threat List Total:	14
EOs with Threat Listed:	Total EOs	% of EOs
	22	63 %
Grazing	10	28%
Road/trail construction/maint.	7	20%
Vandalism/dumping/litter	6	17%
Logging	6	17%
Non-native plant impacts	6	17%
Mining	4	11%
Recreational use (non-ORV)	3	8%
Biocides	2	5%
ORV activity	2	5%
Other	1	2%
Over-collecting/poaching	1	2%
Erosion/runoff	1	2%
Foot traffic/trampling	1	2%
Agriculture	1	2%

Notes




Threats:
Threatened by logging, vehicles, horticultural collecting, reforestation with herbicides, mining, and non-native plants. Possibly threatened by non-native plants, grazing, and mining.
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 16 January 2025].