Taxon Report

Heuchera maxima Greene

island alumroot

Print Report

© 2014 Steve Matson

Classification


Scientific Name:	Heuchera maxima Greene
Common Name:	island alumroot
Family:	Saxifragaceae
Element Code:	PDSAX0E0M0
USDA Plants Symbol:	HEMA4
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: Feb-May	Feb-May
Elevation:	10-500 (35-1640)
General Habitats:	Chaparral, Cismontane woodland, Coastal bluff scrub, 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:	SB_SBBG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	25
Element Occurrence Ranks:
Excellent (A)	3
Good (B)	5
Fair (C)	2
Poor (D)	0
None (X)	0
Unknown (U)	15

Location


California Endemic: True
California Counties and Islands: Name (Code)
Santa Barbara (SBA), Ventura (VEN)
Quads: Name (Quad Code)
Anacapa Island (3311983), 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)

Threat List Data from the CNDDB


Threat List Total:	1
EOs with Threat Listed:	Total EOs	% of EOs
	1	4 %
Erosion/runoff	1	4%

Notes



Surveys in 1994-1996 have located many new populations. Threatened by feral herbivores on SCZ and SRO islands, and potentially threatened by seabird rookery on ANA 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 7 January 2025].