Taxon Report

Trichocoronis wrightii (T. & G.) Gray var. wrightii

Wright's trichocoronis

Print Report

Taxon Summary

Trichocoronis wrightii var. wrightii, commonly known as Wright's trichocoronis, is a annual herb in the Asteraceae that is found in California and elsewhere. It occurs within Marshes and swamps, Meadows and seeps, Riparian forest, and Vernal pools, growing at elevations from 5 to 435 meters. Trichocoronis wrightii var. wrightii is ranked 2B.1, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Trichocoronis wrightii (T. & G.) Gray var. wrightii
Common Name:	Wright's trichocoronis
Family:	Asteraceae
Element Code:	PDAST9F031
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: May-Sep	May-Sep
Elevation:	5-435 (15-1425)
General Habitats:	Marshes and swamps, Meadows and seeps, Riparian forest, Vernal pools
Microhabitat:	Alkaline
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.1
Global Rank:	G4T3
State Rank:	S1
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	changed from 2.1 to 2B.1 on 2013-06-12

Occurrence Data from the CNDDB


Total Occurrences:	12
Element Occurrence Ranks:
Excellent (A)	1
Good (B)	1
Fair (C)	0
Poor (D)	1
None (X)	1
Unknown (U)	8

Location


California Endemic: False
California Counties and Islands: Name (Code)
Colusa (COL), Merced (MER), Riverside (RIV), San Joaquin (SJQ), Sutter (SUT)
Quads: Name (Quad Code)
Arbuckle (3912211), Dunnigan (3812188), El Casco (3311781), Grimes (3912118), Gustine (3712038), Kirkville (3812187), Lakeview (3311771), Lathrop (3712173), Los Banos (3712017), Perris (3311772), San Luis Ranch (3712027), Stevinson (3712037), Tisdale Weir (3912117), Turner Ranch (3712026)

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	2	17 %
Agriculture	1	8%
Grazing	1	8%

Notes



Nearly extirpated in the Central Valley. Habitat lost to agriculture and urbanization. Confusion persists, but plant is probably native to CA. Rare in TX; perhaps more common in northern Mexico. Perhaps best treated as a full species distinct from TX plants.
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 28 September 2025].