Eleocharis acicularis var. acicularis

needle spike-rush

Family:Cyperaceae

Rarity

CNPS-EB: B

7 current natural populations

Criteria:

Limited/Threatened Habitat
Small Populations

Observations

Key

Ecology

Flowers June - September

Habitats:

Miscellaneous Wetlands
Vernal Pool

All Eleocharis

E. acicularis var. acicularis
E. parishii (A1)
E. parvula (*A1)
E. rostellata (A1)

References

Synonyms

Eleocharis acicularis var. submersa

Populations

Key

Location	Pop ID	Last Recorded	Notes
Mt. Diablo State Park - South side	2	2025-06-08
Mt. Diablo State Park - South side	15	2025-06-08
San Francisco Water District land, Sunol	11	2009-12-31
San Leandro Creek South - EBMUD	9	2006-09-27
San Pablo Reservoir - EBMUD	10	2023-11-11
San Pablo Reservoir - EBMUD	14	2024-09-01
Warm Springs, Fremont	12	2019-05-20
Alameda Creek - Sunol Valley section, SFWD	1	2000-12-31	Historic
Del Valle Regional Park	3	1996-12-31	Historic
Gateway area	4	1989-12-31	Historic
Hercules - other or unknown sites	6	1997-12-31	Historic
Lily Spring, San Pablo Ridge - EBMUD land	5	1999-12-31	Historic
Moraga - other or unknown sites	7	1994-12-31	Historic
Pleasanton Ridge Rgnl Park	13	1999-12-31	ID Uncertain
Sibley Rgnl Park	8	1993-12-31	Historic

The list of populations shows the distinct populations identified by the CNPS-EB Rare and Unusual Plants Committee. The locations in this list are very general. More specific location details can be obtained from the links in the Observations section (for some of these links, a login is required).

Font

Populations in bold type have precise coordinates available for field volunteers and researchers.

Populations in normal type are only known from a description of the location; no precise coordinates are available.

Background

Populations with a white background have been observed in the last 25 years.

Populations with a blue background have not been observed for at least 25 years.

Populations with an orange background have an uncertain location or identification, or are planted.

Columns

Pop ID is a label that identifies the population. Many locations have more than one population of a species, and the population ID is used to distinguish them.