Taxon Report

Stylocline citroleum Morefield

oil neststraw

Print Report

Taxon Summary

Stylocline citroleum, commonly known as oil neststraw, is a annual herb in the Asteraceae that is found only in California. It occurs within Chenopod scrub, Coastal scrub, and Valley and foothill grassland, growing at elevations from 50 to 400 meters. Stylocline citroleum is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Stylocline citroleum Morefield
Common Name:	oil neststraw
Family:	Asteraceae
Element Code:	PDAST8Y070
USDA Plants Symbol:	STCI10
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Mar-Apr	Mar-Apr
Elevation:	50-400 (165-1310)
General Habitats:	Chenopod scrub, Coastal scrub, Valley and foothill grassland
Microhabitat:	Clay
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G3
State Rank:	S3
State List:	None
Fed List:	None
Other Status:	BLM_S
CRPR Changes:

Occurrence Data from the CNDDB


Total Occurrences:	84
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	55
Fair (C)	14
Poor (D)	0
None (X)	0
Unknown (U)	15

Location


California Endemic: True
California Counties and Islands: Name (Code)
Kern (KRN), San Diego (SDG)*
Quads: Name (Quad Code)
East Elk Hills (3511934), La Jolla (3211772), La Mesa (3211771), Mouth of Kern (3511923), National City (3211761), Oil Center (3511848)*, Point Loma (3211762), Reward (3511936), Rio Bravo Ranch (3511847), Taft (3511924), Tupman (3511933), West Elk Hills (3511935)

Threat List Data from the CNDDB


Threat List Total:	4
EOs with Threat Listed:	Total EOs	% of EOs
	79	94 %
Mining	77	91%
Road/trail construction/maint.	3	3%
Other	2	2%
Altered flood/tidal/hydrologic regime	1	1%

Notes



Possibly threatened by energy development and urbanization. See Madroño 39(2):123 (1992) for original description and Fremontia 27(1):12-15 (1999) for species account.
Threats:

Taxonomy:

Selected References

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 12 March 2025].