Species Details

Rhamnus alnifolia

alder buckthorn

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Classification

Scientific Name: Rhamnus alnifolia L'Her
Common Name: alder buckthorn
Family:	Rhamnaceae
Element Code:	PDRHA0C010
USDA Plants Symbol:	RHAL
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	2B.2
Fed List:	None
State List:	None
Global Rank:	G5
State Rank:	S3
Other Status:	SB_UCSC
CRPR Changes: changed from 2.2 to 2B.2 on 2013-06-12 added to 2.2 on 2008-03-26
Add Date:	2008-03-26
Date Edited:	2022-12-06

Ecology and Life History

Lifeform: perennial deciduous shrub

Blooming Period: May-Jul

Elevation:
1370 - 2130 meters
4495 - 6990 feet

General Habitats:

Lower montane coniferous forest
Meadows and seeps
Riparian scrub
Upper montane coniferous forest

Microhabitat Details:

Microhabitat:

Notes

Notes: Known in California from fewer that 20 occurrences. Threatened by grazing. Possibly threatened by road maintenance.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	5
	Total EOs	% of EOs
EOs with Threat Listed:	8	30 %
Logging	4	14%
Road/trail construction/maint.	1	3%
Dam/Inundation	1	3%
Development	1	3%
Grazing	1	3%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					27
A	B	C	D	X	U
3	4	0	0	1	19

Occurrence Status:
Historical >20 Years	20
Recent <=20 Years	7

Presence:
Presumed Extant	26
Possibly Extirpated	1
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA), Idaho (ID), Oregon (OR), Utah (UT), Washington (WA), Wyoming (WY)

California Counties and Islands: Name (Code)
Butte (BUT), Lassen (LAS), Nevada (NEV), Placer (PLA), Plumas (PLU), Sierra (SIE)

Quads: Name (Quad Code)
Antelope Lake (4012025), Bucks Lake (3912182), Canyondam (4012121), Caribou (4012112), Cisco Grove (3912035), Gold Lake (3912066), Hobart Mills (3912042), Independence Lake (3912043), Janesville (4012035), Martis Peak (3912031), Mt. Fillmore (3912067), Norden (3912033), Soapstone Hill (3912173), Soda Springs (3912034), Spring Garden (3912087), Tahoe City (3912022), Taylorsville (4012017), Truckee (3912032), Westwood West (4012131)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

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Selected References

CNPS Status Review:

CRPR List Addition on 2008-03-26