Lythrum californicum

California loosestrife

Family:Lythraceae

Rarity

CNPS-EB: B

11 current natural populations

Criteria:

Limited/Threatened Habitat
Declining

Observations

CNPS-EB Database ⓘ
Calflora (group) ⓘ
Calflora (public)
iNaturalist
- Genus Lythrum
- Lythrum californicum
CCH2

Key

Ecology

Flowers April - September

Habitats:

Miscellaneous Wetlands

References

Synonyms

Lythrum alatum var. linearifolium
Lythrum sanfordii

Populations

Key

Location	Pop ID	Last Recorded	Notes
Antioch Dunes	1	2023-06-21
Antioch Dunes	18	2022-07-14
Big Break, Antioch	3	2025-09-25
Black Diamond Rgnl Preserve	4	2018-02-09
Corteva Wetlands	21	2022-08-06
Corteva Wetlands	22	2022-08-06
Hastings Slough	10	2002-07-23
Livermore Valley	19	2021-09-24
Mt. Diablo State Park - South side	20	2021-06-15
Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo	8	2024-09-04
Pacheco Slough	13	2003-06-25
Antioch Shoreline	2	1996-12-31	Historic
Browns Island	5	1991-08-18	Historic
EBMUD land near Wildcat Rgnl Park	17	1989-12-31	Historic
Mt. Diablo State Park - East side	6	1932-12-31	Historic
Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo	7	1930-12-31	Historic
Mt. Diablo State Park - West side	9	1930-12-31	Historic
Mt. Diablo State Park - West side	23	1993-12-31	ID Uncertain
Newark	11	1897-12-31	Historic
Niles Canyon area	12	1970-12-31	Historic
Pt. Edith	14	1996-10-17	Historic
Round Valley Rgnl Park	16	1996-03-01	ID Uncertain
San Leandro Reservoir - EBMUD	15	1989-12-31	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.