Cyperus erythrorhizos

red-rooted cyperus

Family:Cyperaceae

Rarity

CNPS-EB: B

9 current natural populations

Criteria:

Limited/Threatened Habitat

Observations

CNPS-EB Database ⓘ
Calflora (group) ⓘ
Calflora (public)
iNaturalist
- Genus Cyperus
- Cyperus erythrorhizos
CCH2

Key

Ecology

Flowers July - October

Habitats:

Riparian

All Cyperus

C. erythrorhizos
C. niger (B)
C. odoratus (A1)
C. strigosus (A1)

References

Populations

Key

Location	Pop ID	Last Recorded	Notes
Chabot Rgnl Park	4	2004-11-20
San Leandro Creek South - EBMUD	7	2006-09-27
San Leandro Reservoir - EBMUD	17	2023-09-04
San Pablo Reservoir - EBMUD	8	2005-10-12
San Pablo Reservoir - EBMUD	9	2020-10-17
San Pablo Reservoir - EBMUD	13	2021-09-04
San Pablo Reservoir - EBMUD	14	2022-08-20
San Pablo Reservoir - EBMUD	15	2021-08-09
Tilden Rgnl Park - Jewel Lake/Nature area	16	2021-09-11
Berkeley Shoreline	1	1940-09-09	Historic
Bethel Island	2	1998-12-31	Historic
Browns Island	3	1978-12-31	Historic
Cull Canyon Rgnl Park	10	2001-09-18	ID Uncertain
Hercules Shoreline	5	1980-08-26	Historic
Lafayette Reservoir - EBMUD	6	1991-09-22	Historic
Niles Canyon area	12	2004-07-24	ID Uncertain

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.