Taxon Report

Calycadenia oppositifolia (Greene) Greene

Butte County calycadenia

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Taxon Summary

Calycadenia oppositifolia, commonly known as Butte County calycadenia, is a annual herb in the Asteraceae that is found only in California. It occurs within Chaparral, Cismontane woodland, Lower montane coniferous forest, Meadows and seeps, and Valley and foothill grassland, growing at elevations from 90 to 945 meters. Calycadenia oppositifolia is ranked 4.2, Plants of Limited Distribution, A Watch List; Moderately threatened in California.

Classification


Scientific Name:	Calycadenia oppositifolia (Greene) Greene
Common Name:	Butte County calycadenia
Family:	Asteraceae
Element Code:	PDAST1P070
USDA Plants Symbol:	CAOP
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Apr-Jul	Apr-Jul
Elevation:	90-945 (295-3100)
General Habitats:	Chaparral, Cismontane woodland, Lower montane coniferous forest, Meadows and seeps, Valley and foothill grassland
Microhabitat:	Granitic (sometimes), Openings, Serpentine (sometimes), Volcanic
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	4.2
Global Rank:	G3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	USFS_S
CRPR Changes:	changed from 1B to 4 on 2004-08-27

Occurrence Data from the CNDDB


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

Location


California Endemic: True
California Counties and Islands: Name (Code)
Butte (BUT)
Quads: Name (Quad Code)
Bangor (3912144), Berry Creek (3912164), Butte Meadows (4012115), Cherokee (3912165), Chico (3912167), Hamlin Canyon (3912166), Oroville (3912155), Oroville Dam (3912154), Paradise East (3912175), Paradise West (3912176), Pulga (3912174), Richardson Springs (3912177)

Threat List Data from the CNDDB


Threat List Total:	0
EOs with Threat Listed:	Total EOs	% of EOs
	0	0 %

Notes



Can be locally abundant. Threatened by development, road construction, road maintenance, vehicles, recreational activities, and grazing. See Bulletin of the Torrey Botanical Club 9:110 (1882) for original description, and Flora Franciscana p. 423 (1897) for revised nomenclature.
Threats:

Taxonomy:

Selected References

Proposed Rank Change from CRPR 1B to 4 (2004)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 27 January 2025].