Ambrosia chamissonis

beach bur-sage, beach-bur

Family:Asteraceae

Rarity

CNPS-EB: C

21 current natural populations

Criteria:

Limited/Threatened Habitat

Observations

CNPS-EB Database ⓘ
Calflora (group) ⓘ
Calflora (public)
iNaturalist
- Genus Ambrosia
- Ambrosia chamissonis
CCH2

Key

Ecology

Flowers May - October

Habitats:

Coastal Strand
Sand, Sandstone

References

Synonyms

Ambrosia chamissonis var. bipinnatisecta
Franseria chamissonis
Franseria chamissonis subsp. bipinnatisecta

Populations

Key

Location	Pop ID	Last Recorded	Notes
Alameda Shore	1	2024-07-05
Alameda Shore	22	2023-09-29
Alameda Shore	23	2023-07-23
Alameda Shore	24	2026-01-14
Alameda Shore	25	2017-09-28
Albany Shoreline	2	2023-08-02
Bay Farm Island - S end of Alameda	19	2023-08-31
Berkeley Shoreline	3	2023-08-04
Berkeley Shoreline	13	2022-06-30
Berkeley Shoreline	18	2025-07-26
Brooks Island Rgnl Park	4	2005-12-31
Emeryville	5	2023-08-10
Miller - Knox Rgnl Park	9	2023-08-18
Pt. Molate	14	2022-08-05
Pt. Pinole Rgnl Park	20	2021-07-03
Richmond Shoreline	10	2023-08-01
Richmond Shoreline	15	2023-08-18
Richmond Shoreline	21	2017-06-04
Rodeo Shoreline	11	2004-07-08
San Leandro Bay	16	2023-08-08
San Lorenzo Creek - near bay	12	2023-08-08
Oakland Shoreline	17	2023-09-08	Planted
Oyster Bay Rgnl Shoreline	6	1958-12-31	Historic
Pt. Molate	7	2000-09-08	Historic
Pt. Richmond Area	8	1975-12-31	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.