Taxon Details

Carex holmgreniorum

Holmgren's sedge

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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:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	2B.2
Fed List:	None
State List:	None
Global Rank:
State Rank:
Other Status:
CRPR Changes: added to 2B.2 on 2025-06-11
Add Date:	2025-06-11
Date Edited:	2025-06-12

Ecology and Life History

Lifeform: perennial rhizomatous herb

Blooming Period: May-Sep

Elevation:
1275 - 1275 meters
4185 - 4185 feet

General Habitats:

Meadows and seeps
Playas

Microhabitat Details: At Fish Slough, found in alkaline meadow with shallow water table on silty alluvium.

Microhabitat:

Alkaline

Notes

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.

Threat List Data from the CNDDB

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

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					0
A	B	C	D	X	U
0	0	0	0	0	0

Occurrence Status:
Historical >20 Years	0
Recent <=20 Years	0

Presence:
Presumed Extant	0
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA), Colorado (CO), Idaho (ID), Nevada (NV), Utah (UT)

California Counties and Islands: Name (Code)

Quads: Name (Quad Code)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Location Data is Forthcoming from the CNDDB

Presumed Extant

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CNPS Status Review:	Proposed addition to CRPR 2B.2, G1G3 / S1 (2025)
Original Description:	Rhodora 70: 419–421 (1968)
Revised Nomenclature:	Journal of the Botanical Research Institute of Texas 7: 37–51 (2013)
Taxonomic Treatment:	Journal of the Botanical Research Institute of Texas 7: 37–51 (2013)