Taxon Report

Schoenus nigricans L.

black bog-rush

Print Report

Taxon Summary

Schoenus nigricans, commonly known as black bog-rush, is a perennial herb in the Cyperaceae that is found in California and elsewhere. It occurs within Marshes and swamps, growing at elevations from 150 to 2000 meters. Schoenus nigricans is ranked 2B.2, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Schoenus nigricans L.
Common Name:	black bog-rush
Family:	Cyperaceae
Element Code:	PMCYP0P010
USDA Plants Symbol:	SCNI
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial herb
Blooming Period: Aug-Sep	Aug-Sep
Elevation:	150-2000 (490-6560)
General Habitats:	Marshes and swamps
Microhabitat:
Microhabitat Details:

Conservation Status


CA Rare Plant Rank:	2B.2
Global Rank:	G4
State Rank:	S2
State List:	None
Fed List:	None
Other Status:	IUCN_LC; USFS_S
CRPR Changes:	changed from 2.2 to 2B.2 on 2013-06-12

Occurrence Data from the CNDDB


Total Occurrences:	13
Element Occurrence Ranks:
Excellent (A)	2
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	0
Unknown (U)	11

Location


California Endemic: False
California Counties and Islands: Name (Code)
Inyo (INY), San Bernardino (SBD)
Quads: Name (Quad Code)
Cajon (3411734), Furnace Creek (3611647), Nevares Peak (3611657), Red Pass Lake Ne (3511643), San Bernardino North (3411723), Telegraph Peak (3411735), Ubehebe Crater (3711714)

Threat List Data from the CNDDB


Threat List Total:	5
EOs with Threat Listed:	Total EOs	% of EOs
	4	31 %
Non-native plant impacts	2	15%
ORV activity	1	7%
Road/trail construction/maint.	1	7%
Surface water diversion	1	7%
Groundwater pumping	1	7%

Notes



See Madroño 43(4):530 (1996) for information on CA distribution.
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 25 November 2025].