Taxon Report

Ravenella exigua (Rattan) Morin

chaparral harebell

Print Report

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

Ecology and Life History


Lifeform:	annual herb
Blooming Period: May-Jun	May-Jun
Elevation:	275-1250 (900-4100)
General Habitats:	Chaparral
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.2
Global Rank:	G2
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	BLM_S; SB_CalBG/RSABG
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	50
Element Occurrence Ranks:
Excellent (A)	8
Good (B)	6
Fair (C)	5
Poor (D)	0
None (X)	0
Unknown (U)	31

Location


California Endemic: True
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)

Threat List Data from the CNDDB


Threat List Total:	6
EOs with Threat Listed:	Total EOs	% of EOs
	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%

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:

Selected References

Non-Substantive Name Changes: Multiple taxa in Campanulaceae (2022-12-19)

Phytoneuron 2020-49: 1–46 (2020)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 8 January 2025].