Taxon Report

Castilleja affinis Hook. & Arn. var. neglecta (Zeile) J.M. Egger

Tiburon paintbrush

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Taxon Summary

Castilleja affinis var. neglecta, commonly known as Tiburon paintbrush, is a perennial herb (hemiparasitic) in the Orobanchaceae that is found only in California. It occurs within Valley and foothill grassland, growing at elevations from 60 to 400 meters. Castilleja affinis var. neglecta is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Castilleja affinis Hook. & Arn. var. neglecta (Zeile) J.M. Egger
Common Name:	Tiburon paintbrush
Family:	Orobanchaceae
Element Code:	PDSCR0D013
USDA Plants Symbol:
Synonyms/Other Names:	Castilleja neglecta Zeile Castilleja affinis ssp. neglecta

Ecology and Life History


Lifeform:	perennial herb (hemiparasitic)
Blooming Period: Apr-Jun	Apr-Jun
Elevation:	60-400 (195-1310)
General Habitats:	Valley and foothill grassland
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G4G5T1T2
State Rank:	S1S2
State List:	CT
Fed List:	FE
Other Status:	SB_CalBG/RSABG; SB_UCBG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	7
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	4
Fair (C)	1
Poor (D)	0
None (X)	0
Unknown (U)	0

Location


California Endemic: True
California Counties and Islands: Name (Code)
Marin (MRN), Napa (NAP), Santa Clara (SCL)
Quads: Name (Quad Code)
Cordelia (3812222), Morgan Hill (3712126), San Geronimo (3812216), San Quentin (3712284)

Threat List Data from the CNDDB


Threat List Total:	9
EOs with Threat Listed:	Total EOs	% of EOs
	7	100 %
Non-native plant impacts	5	71%
Other	3	42%
Grazing	3	42%
Development	2	28%
Foot traffic/trampling	2	28%
ORV activity	2	28%
Feral pigs	1	14%
Landfill	1	14%
Mining	1	14%

Notes



Threatened by development, gravel mining, grazing, and non-native plants. See C. affinis ssp. neglecta in TJM 2. See Phytologia 90(1):63-81 (2008) 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 14 November 2025].