Taxon Report

Rhamnus pirifolia Greene

island redberry

Print Report

Taxon Summary

Rhamnus pirifolia, commonly known as island redberry, is a perennial evergreen tree in the Rhamnaceae that is found in California and elsewhere. It occurs within Chaparral, Cismontane woodland, Closed-cone coniferous forest, and Coastal scrub, growing at elevations from 20 to 430 meters. Rhamnus pirifolia is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Rhamnus pirifolia Greene
Common Name:	island redberry
Family:	Rhamnaceae
Element Code:	PDRHA0C0A0
USDA Plants Symbol:	RHPI
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial evergreen tree
Blooming Period: Feb-Jul	Feb-Jul
Elevation:	20-430 (65-1410)
General Habitats:	Chaparral, Cismontane woodland, Closed-cone coniferous forest, Coastal scrub
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G4
State Rank:	S4
State List:	None
Fed List:	None
Other Status:	SB_CalBG/RSABG
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: False
California Counties and Islands: Name (Code)
Los Angeles (LAX), Santa Barbara (SBA)
Quads: Name (Quad Code)
San Clemente Island Central (3211874), San Clemente Island South (3211873), Santa Catalina East (3311833), Santa Catalina North (3311844), Santa Catalina South (3311834), Santa Catalina West (3311845), Santa Cruz Island B (3311986), Santa Cruz Island C (3311985), 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 non-native feral herbivores on SCI Isl. Possibly threatened by development. See Pittonia 3:15 (1896) for original description.
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 March 2025].