Taxon Details

Ravenella exigua

chaparral harebell

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Taxon Summary:

Ravenella exigua, commonly known as chaparral harebell, is a annual herb in the Campanulaceae that is found only in California. It occurs within Chaparral (rocky, and usually serpentinite), growing at elevations from 275 to 1250 meters. Ravenella exigua is ranked 1B.2, Plants Rare, Threatened or Endangered in California and Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Ravenella exigua (Rattan) Morin
Common Name: chaparral harebell
Family:	Campanulaceae
Element Code:	PDCAM020A0
USDA Plants Symbol:	CAEX3
Synonyms/Other Names: Campanula exigua
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.2
Fed List:	None
State List:	None
Global Rank:	G2
State Rank:	S2
Other Status:	BLM_S; SB_CalBG/RSABG
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2023-01-13

Ecology and Life History

Lifeform: annual herb

Blooming Period: May-Jun

Elevation:
275 - 1250 meters
900 - 4100 feet

General Habitats:

Chaparral (rocky, usually serpentinite)

Microhabitat Details:

Microhabitat:

Notes

Notes: Possibly threatened by mining and vehicles. See Botanical Gazette 11:339 (1886) for original description, and Madroño 27(4):149-163 (1980) for taxonomic treatment.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	6
	Total EOs	% of EOs
EOs with Threat Listed:	11	22 %
Road/trail construction/maint.	8	16%
Grazing	3	6%
Mining	1	2%
Non-native plant impacts	1	2%
Development	1	2%
Erosion/runoff	1	2%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					50
A	B	C	D	X	U
8	6	5	0	0	31

Occurrence Status:
Historical >20 Years	27
Recent <=20 Years	23

Presence:
Presumed Extant	50
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Alameda (ALA), Contra Costa (CCA), Fresno (FRE), Merced (MER), San Benito (SBT), Santa Clara (SCL), Stanislaus (STA)

Quads: Name (Quad Code)
Calaveras Reservoir (3712147), Cedar Mtn. (3712155), Clayton (3712188), Diablo (3712178), Gilroy Hot Springs (3712114), Hepsedam Peak (3612037), Idria (3612046), Isabel Valley (3712135), La Costa Valley (3712157), Lick Observatory (3712136), Mariposa Peak (3612182), Midway (3712165), Mississippi Creek (3712124), Mt. Boardman (3712144), Mt. Day (3712146), Niles (3712158), Panoche Pass (3612161), Rock Spring Peak (3612048), San Benito (3612151), San Benito Mtn. (3612036), Santa Rita Peak (3612035), Wilcox Ridge (3712133)

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

Click on quad for name. Hold Shift Key to use mouse scroll wheel

CNPS Name Change:	Non-Substantive Name Changes: Multiple taxa in Campanulaceae (2022-12-19)
Revised Nomenclature:	Phytoneuron 2020-49: 1–46 (2020)

CNPS Rare Plant Inventory