CNPS Inventory Plant Detail

Dirca occidentalis

Common Name:	western leatherwood
Family:	Thymelaeaceae
Synonyms:
Element Code:	PDTHY03010
Full Name:	Dirca occidentalis Gray
USDA PLANTS Symbol:	DIOC3

Biology
Lifeform: perennial deciduous shrub Blooming Period: January - April Habitat: mesic. • Broadleafed upland forest • Closed-cone coniferous forest • Chaparral • Cismontane woodland • North Coast coniferous forest • Riparian forest • Riparian woodland

Rarity Status
Rare Plant Rank: 1B.2 Rare, threatened, or endangered in California and elsewhere .2: Fairly endangered in California Federal Listing Status: Not Listed State Listing Status: Not Listed State Rank: S2S3 S2: Imperiled. S3: Vulnerable. Global Rank: G2G3 G2: Imperiled. G3: Vulnerable.

Occurrence Data from DFG
California Natural Diversity Database

Total # of Known Element Occurrences: 52
Element Occurrence Ranks:

A B C D X U

1 14 9 1 0 27

Population Status:

Historic >20 yrs	Recent <=20 yrs
17	35

Presence:

Present Extant	Possibly Extirpated	Extirpated
52	0	0

Notes
Possibly threatened by road maintenance. Populations declining; not reproducing well. To submit rare plant observation data, use the CNDDB field survey form. Please see also the CNPS Rare Plant Data page. Date Added: 1974-01-01 Last Update: 2012-06-15

Location

Elevation: 25 - 425 meters

California Endemic: yes

States: California

California Counties and Islands: name (code)
Alameda (ALA), Contra Costa (CCA), Marin (MRN), Santa Clara (SCL), San Mateo (SMT), Sonoma (SON)

Quads: name (DWR code) USGS code
Palo Alto (428B) 37122D2, Mindego Hill (428C) 37122C2, Cupertino (428D) 37122C1, Woodside (429A) 37122D3, La Honda (429D) 37122C3, Hayward (447A) 37122F1, Montara Mountain (448C) 37122E4, San Mateo (448D) 37122E3, Diablo (464C) 37121G8, Briones Valley (465B) 37122H2, Oakland East (465C) 37122G2, Las Trampas Ridge (465D) 37122G1, Richmond (466A) 37122H3, Bolinas (467B) 37122H6, Benicia (482C) 38122A2, San Geronimo (484C) 38122A6, Inverness (485D) 38122A7, Valley Ford (502C) 38122C8, Bodega Head (503D) 38123C1

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

567

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

Suggested Citation
CNPS, Rare Plant Program. . Inventory of Rare and Endangered Plants (online edition, v8-02). California Native Plant Society, Sacramento, CA. Website http://www.rareplants.cnps.org [accessed ].

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