Taxon Report

Harmonia stebbinsii (T.W. Nelson & J.P. Nelson) B.G. Baldwin

Stebbins' harmonia

Print Report

Taxon Summary

Harmonia stebbinsii, commonly known as Stebbins' harmonia, is a annual herb in the Asteraceae that is found only in California. It occurs within Chaparral, and Lower montane coniferous forest, growing at elevations from 400 to 1580 meters. Harmonia stebbinsii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Harmonia stebbinsii (T.W. Nelson & J.P. Nelson) B.G. Baldwin
Common Name:	Stebbins' harmonia
Family:	Asteraceae
Element Code:	PDAST650K0
USDA Plants Symbol:	HAST10
Synonyms/Other Names:	Madia stebbinsii T.W. Nelson & J.P. Nelson

Ecology and Life History


Lifeform:	annual herb
Blooming Period: May-Jun	May-Jun
Elevation:	400-1580 (1310-5185)
General Habitats:	Chaparral, Lower montane coniferous forest
Microhabitat:	Serpentine
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_UCSC; USFS_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	21
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	11
Fair (C)	1
Poor (D)	1
None (X)	0
Unknown (U)	6

Location


California Endemic: True
California Counties and Islands: Name (Code)
Lake (LAK), Shasta (SHA), Tehama (TEH), Trinity (TRI)
Quads: Name (Quad Code)
Beegum (4012237), Fouts Springs (3912236), Hall Ridge (3912276), Platina (4012238), Pony Buck Peak (4012331), Riley Ridge (3912286), Smoky Creek (4012332), Tomhead Mtn. (4012227), Wildwood (4012341)

Threat List Data from the CNDDB


Threat List Total:	5
EOs with Threat Listed:	Total EOs	% of EOs
	14	67 %
Road/trail construction/maint.	12	57%
Logging	8	38%
Mining	1	4%
Non-native plant impacts	1	4%
Improper burning regime	1	4%

Notes




Threats:
Possibly threatened by road maintenance.
Taxonomy:
A synonym of Madia stebbinsii in The Jepson Manual.

Selected References

Brittonia 32(3):323 (1980)

Novon 9:462-471 (1999)

Harmonia stebbinsii profile for potential Species of Conservation Concern evaluation (2022)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 30 October 2025].