Taxon Report

Trichostema austromontanum Lewis ssp. compactum Lewis

Hidden Lake bluecurls

Print Report

Taxon Summary

Trichostema austromontanum ssp. compactum, commonly known as Hidden Lake bluecurls, is a annual herb in the Lamiaceae that is found only in California. It occurs within Upper montane coniferous forest, growing at elevations from 2400 to 2680 meters. Trichostema austromontanum ssp. compactum is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Trichostema austromontanum Lewis ssp. compactum Lewis
Common Name:	Hidden Lake bluecurls
Family:	Lamiaceae
Element Code:	PDLAM22022
USDA Plants Symbol:	TRAUC
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Jul-Sep	Jul-Sep
Elevation:	2400-2680 (7875-8795)
General Habitats:	Upper montane coniferous forest
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G3G4T1
State Rank:	S1
State List:	None
Fed List:	FD
Other Status:	SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	1
Element Occurrence Ranks:
Excellent (A)	1
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)
Riverside (RIV)
Quads: Name (Quad Code)
San Jacinto Peak (3311676)

Threat List Data from the CNDDB


Threat List Total:	3
EOs with Threat Listed:	Total EOs	% of EOs
	1	100 %
Foot traffic/trampling	1	100%
Other	1	100%
Recreational use (non-ORV)	1	100%

Notes



Federally listed as Threatened on 1998-10-14; Delisted due to Recovery on 2018-07-02. Known only from Hidden Lake in the San Jacinto Mtns. Only known occurrence is located in Mount San Jacinto State Park. See Brittonia 5:285 (1945) for original description.
Threats:
Threatened by trampling and recreational activities.
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 5 November 2025].