Taxon Report

Acmispon dendroideus (Greene) Brouillet var. dendroideus

island broom

Print Report

Taxon Summary

Acmispon dendroideus var. dendroideus, commonly known as island broom, is a perennial shrub in the Fabaceae that is found only in California. It occurs within Chaparral, Cismontane woodland, Closed-cone coniferous forest, Coastal bluff scrub, and Coastal scrub, growing at elevations from 3 to 460 meters. Acmispon dendroideus var. dendroideus is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Acmispon dendroideus (Greene) Brouillet var. dendroideus
Common Name:	island broom
Family:	Fabaceae
Element Code:	PDFAB2A1G1
USDA Plants Symbol:
Synonyms/Other Names:	Lotus scoparius var. dendroideus Lotus dendroideus var. dendroideus

Ecology and Life History


Lifeform:	perennial shrub
Blooming Period: Jan-Aug(Oct)	Jan-Aug(Oct)
Elevation:	3-460 (10-1510)
General Habitats:	Chaparral, Cismontane woodland, Closed-cone coniferous forest, Coastal bluff scrub, Coastal scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G4T3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG; SB_USDA
CRPR Changes:

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)
Los Angeles (LAX), Santa Barbara (SBA), Ventura (VEN)
Quads: Name (Quad Code)
Anacapa Island (3311983), San Miguel Island East (3312083), Santa Catalina East (3311833), Santa Catalina North (3311844), Santa Catalina West (3311845), Santa Cruz Island A (3311987), Santa Cruz Island B (3311986), Santa Cruz Island C (3311985), Santa Cruz Island D (3311984), Santa Rosa Island East (3311988), 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	0 %

Notes



Threatened by feral herbivores. See Brittonia 30:467 (1978) 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 25 October 2025].