CNPS Inventory Plant Detail

Rhamnus alnifolia

Common Name:	alder buckthorn
Family:	Rhamnaceae
Synonyms:
Element Code:	PDRHA0C010
Full Name:	Rhamnus alnifolia L'Her
USDA PLANTS Symbol:	RHAL

Biology
Lifeform: perennial deciduous shrub Blooming Period: May - July Habitat: • Lower montane coniferous forest • Meadows and seeps • Riparian scrub • Upper montane coniferous forest

Rarity Status
CA Rare Plant Rank: 2.2 Rare, threatened, or endangered in California, but more common elsewhere .2: Fairly endangered in California Federal Listing Status: Not Listed State Listing Status: Not Listed State Rank: S2.2 S2: Imperiled. .2: Threatened. Global Rank: G5 G5: Secure, considering populations outside California.

Occurrence Data from DFG
California Natural Diversity Database

Total # of Known Element Occurrences: 16
Element Occurrence Ranks:

A B C D X U

0 0 0 0 1 15

Population Status:

Historic >20 yrs	Recent <=20 yrs
8	8

Presence:

Present Extant	Possibly Extirpated	Extirpated
15	1	0

Notes
Known in California from fewer that 20 occurrences. Threatened by grazing. Possibly threatened by road maintenance. To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page. Date Added: 2008-03-26 Last Update: 2011-05-06

Location

Elevation: 1370 - 2130 meters

California Endemic: no

States: California, Idaho, Oregon, Utah, Washington, Wyoming

California Counties and Islands: name (code)
Alpine (ALP), Nevada (NEV), Placer (PLA), Plumas (PLU), Sierra (SIE)

Quads: name (DWR code) USGS code
Woodfords (522D) 38119G7, Tahoe City (538B) 39120B2, Hobart Mills (554B) 39120D2, Truckee (554C) 39120C2, Independence Lake (555A) 39120D3, Norden (555D) 39120C3, Spring Garden (589A) 39120H7, Antelope Lake (604A) 40120B5, Taylorsville (605D) 40120A7, Caribou (606C) 40121A2, Janesville (622D) 40120C5, Westwood West (624D) 40121C1

Notes:

Definitions of codes preceding a county and/or quad:
*		Presumed extirpated
?		Uncertain about distribution or identity
?*		Uncertain about distribution, but presumed extirpated if once present
(?)		Occurrence confirmed, but possibly extirpated

Species may be present in other areas where conditions are favorable.

Presumed Extant

Presumed Extirpated or Unknown

3299

Links to Leading Resources of Taxon Information
USDA PLANTS Calflora CalPhotos Consortium of California Herbaria California Department of Fish and Game: CNDDB Quick Viewer

Suggested Citation
California Native Plant Society (CNPS). Inventory of Rare and Endangered Plants (online edition, v8-01a). California Native Plant Society. Sacramento, CA. Accessed on .

-120.25,39.375