Taxon Details

Juncus supiniformis

hair-leaved rush

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Taxon Summary:

Juncus supiniformis, commonly known as hair-leaved rush, is a perennial rhizomatous herb in the Juncaceae that is found in California and elsewhere. It occurs within Bogs and fens, and Marshes and swamps (freshwater), growing at elevations from 20 to 100 meters. Juncus supiniformis is ranked 2B.2, Plants Rare, Threatened, or Endangered in California, But More Common Elsewhere; Moderately threatened in California.

Classification

Scientific Name: Juncus supiniformis Engelm.
Common Name: hair-leaved rush
Family:	Juncaceae
Element Code:	PMJUN012R0
USDA Plants Symbol:	JUSU3
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:	G5
State Rank:	S1
Other Status:	IUCN_LC
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2025-10-29

Ecology and Life History

Lifeform: perennial rhizomatous herb

Blooming Period: Apr-May(Jun-Jul)

Elevation:
20 - 100 meters
65 - 330 feet

General Habitats:

Bogs and fens
Marshes and swamps (freshwater)

Microhabitat Details: near coast

Microhabitat:

Notes

Notes: Need quads for HUM co. Can be confused with J. articulatus. See Transactions of the Academy of Science of St. Louis 2:461 (1868) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	4
	Total EOs	% of EOs
EOs with Threat Listed:	2	33 %
Development	1	16%
ORV activity	1	16%
Other	1	16%
Recreational use (non-ORV)	1	16%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					6
A	B	C	D	X	U
0	1	1	1	0	3

Occurrence Status:
Historical >20 Years	1
Recent <=20 Years	5

Presence:
Presumed Extant	6
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
Alaska (AK), California (CA), Oregon (OR), Washington (WA)

California Counties and Islands: Name (Code)
Mendocino (MEN)

Quads: Name (Quad Code)
Fort Bragg (3912347), Mendocino (3912337)

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

Presumed Extant

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CNPS Rare Plant Inventory