Taxon Report

Castilleja hololeuca Greene

island white-felted paintbrush

This taxon is in review.

Print Report

Keir Morse

Species Description:
Castilleja hololeuca, commonly known as island white-felted paintbrush, is a perennial herb (hemiparasitic) in the Orobanchaceae that is found only in California. It occurs within Chaparral, Closed-cone coniferous forest, and Coastal scrub, growing at elevations from 20 to 365 meters. Castilleja hololeuca is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Castilleja hololeuca Greene
Common Name:	island white-felted paintbrush
Family:	Orobanchaceae
Element Code:	PDSCR0D1L1
USDA Plants Symbol:
Synonyms/Other Names:	Castilleja lanata ssp. hololeuca

Ecology and Life History


Lifeform:	perennial herb (hemiparasitic)
Blooming Period: Feb-Sep	Feb-Sep
Elevation:	20-365 (65-1200)
General Habitats:	Chaparral, Closed-cone coniferous forest, Coastal scrub
Microhabitat:	Rocky
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	41
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	1
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	40

Location


California Endemic: True
California Counties and Islands: Name (Code)
Santa Barbara (SBA), Ventura (VEN)
Quads: Name (Quad Code)
Anacapa Island (3311983), San Miguel Island East (3312083), San Miguel Island West (3312084), Santa Cruz Island A (3311987), Santa Cruz Island B (3311986), Santa Cruz Island C (3311985), Santa Cruz Island D (3311984), Santa Rosa Island North (3312081), Santa Rosa Island South (3312071)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	%

Notes



Threatened by feral herbivores on SCZ and SRO islands; also by grazing on SRO Isl.
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 20 January 2025].