Taxon Report

Harmonia guggolziorum B.G. Baldwin

Guggolz's harmonia

Print Report

Taxon Summary

Harmonia guggolziorum, commonly known as Guggolz's harmonia, is a annual herb in the Asteraceae that is found only in California. It occurs within Chaparral (openings, and serpentine), growing at elevations from 160 to 195 meters. Harmonia guggolziorum is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Harmonia guggolziorum B.G. Baldwin
Common Name:	Guggolz's harmonia
Family:	Asteraceae
Element Code:	PDAST650M0
USDA Plants Symbol:	HAGU
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Apr-May	Apr-May
Elevation:	160-195 (525-640)
General Habitats:	Chaparral
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1
State Rank:	S1
State List:	None
Fed List:	None
Other Status:	SB_UCSC
CRPR Changes:	added to 1B on 2003-05-14

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)
Mendocino (MEN)
Quads: Name (Quad Code)
Yorkville (3812382)

Threat List Data from the CNDDB


Threat List Total:	5
EOs with Threat Listed:	Total EOs	% of EOs
	2	100 %
Agriculture	2	100%
Development	2	100%
Road/trail construction/maint.	2	100%
Grazing	1	50%
Non-native plant impacts	1	50%

Notes



Known from only two occurrences near Hopland.
Threats:
Potentially threatened by non-native plants, vineyard expansion, development, and road widening and construction.
Taxonomy:
See Madroño 48(4):293 (2001) for original description.

Selected References

CRPR List Addition on 2003-05-14

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 12 November 2025].