Taxon Report

Grindelia hallii Steyerm

San Diego gumplant

Print Report

Taxon Summary

Grindelia hallii, commonly known as San Diego gumplant, is a perennial herb in the Asteraceae that is found only in California. It occurs within Chaparral, Lower montane coniferous forest, Meadows and seeps, and Valley and foothill grassland, growing at elevations from 185 to 1745 meters. Grindelia hallii is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Grindelia hallii Steyerm
Common Name:	San Diego gumplant
Family:	Asteraceae
Element Code:	PDAST470D4
USDA Plants Symbol:
Synonyms/Other Names:	Grindelia hirsutula var. hallii

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: May-Oct	May-Oct
Elevation:	185-1745 (605-5725)
General Habitats:	Chaparral, Lower montane coniferous forest, Meadows and seeps, Valley and foothill grassland
Microhabitat:
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_CRES
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	66
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	5
Fair (C)	10
Poor (D)	4
None (X)	0
Unknown (U)	45

Location


California Endemic: True
California Counties and Islands: Name (Code)
San Diego (SDG)
Quads: Name (Quad Code)
Cuyamaca Peak (3211685), Descanso (3211675), El Cajon (3211678), Imperial Beach (3211751), Jamul Mountains (3211668), Julian (3311615), La Mesa (3211771), Mesa Grande (3311627), Monument Peak (3211684), Mount Laguna (3211674), National City (3211761), Otay Mesa (3211658), Potrero (3211655), Poway (3211781), Ranchita (3311625), Santa Ysabel (3311616), Tecate (3211656)

Threat List Data from the CNDDB


Threat List Total:	12
EOs with Threat Listed:	Total EOs	% of EOs
	26	39 %
Road/trail construction/maint.	11	16%
Grazing	10	15%
ORV activity	8	12%
Non-native plant impacts	4	6%
Development	4	6%
Recreational use (non-ORV)	4	6%
Wood cutting or brush clearing	3	4%
Logging	3	4%
Other	3	4%
Foot traffic/trampling	2	3%
Erosion/runoff	1	1%
Vandalism/dumping/litter	1	1%

Notes



Threatened by grazing, road maintenance, invasive species, and development. See Annals of the Missouri Botanical Garden 21:229 (1934) for original description, and Novon 2(3):215-217 (1992) for revised nomenclature.
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 5 February 2025].