Taxon Report

Carex holmgreniorum Reznicek & D.F. Murray

Holmgren's sedge

Print Report

Taxon Summary

Carex holmgreniorum, commonly known as Holmgren's sedge, is a perennial rhizomatous herb in the Cyperaceae that is found in California and elsewhere. It occurs within Meadows and seeps, and Playas, growing at elevations from 1275 to 1275 meters. Carex holmgreniorum is ranked 2B.2, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Moderately threatened in California.

Classification


Scientific Name:	Carex holmgreniorum Reznicek & D.F. Murray
Common Name:	Holmgren's sedge
Family:	Cyperaceae
Element Code:	PMCYP03A34
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	perennial rhizomatous herb
Blooming Period: May-Sep	May-Sep
Elevation:	1275-1275 (4185-4185)
General Habitats:	Meadows and seeps, Playas
Microhabitat:	Alkaline
Microhabitat Details:	At Fish Slough, found in alkaline meadow with shallow water table on silty alluvium.

Conservation Status


CA Rare Plant Rank:	2B.2
Global Rank:
State Rank:
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	added to 2B.2 on 2025-06-11

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: False
California Counties and Islands: Name (Code)

Quads: Name (Quad Code)

Threat List Data from the CNDDB


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

Notes



Discovered in CA by S. Matson in 2013. Fish Slough occurrence within fenced area of the Fish Slough BLM ACEC.
Threats:
Threatened by hydrological alterations and potentially threatened by wildfire.
Taxonomy:
The name Carex holmgreniorum was first published in 2013 for Great Basin plants assigned to the name C. parryana var. brevisquama, since the epithet brevisquama was already in use at the species level. Carex holmgreniorum was not verified as being in California until 2023. For identification criteria, see the CNPS Status Review in Selected References.

Selected References

Proposed addition to CRPR 2B.2, G1G3 / S1 (2025)

Rhodora 70: 419–421 (1968)

Journal of the Botanical Research Institute of Texas 7: 37–51 (2013)

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 June 2025].