Bidens laevis

bur-marigold

Family:Asteraceae

Rarity

CNPS-EB: B

8 current natural populations

Criteria:

Limited/Threatened Habitat
Narrow Range in ALA & CCA

Observations

CNPS-EB Database ⓘ
Calflora (group) ⓘ
Calflora (public)
iNaturalist
- Genus Bidens
- Bidens laevis
CCH2

Key

Ecology

Flowers August - November

Habitats:

Freshwater Marsh
Miscellaneous Wetlands

All Bidens

B. frondosa (B)
B. laevis

References

Populations

Key

Location	Pop ID	Last Recorded	Notes
Antioch Dunes	1	2023-11-08
Antioch Dunes	12	2022-08-11
Antioch Shoreline	2	2020-02-02
Big Break, Antioch	11	2020-11-03
Browns Island	14	2020-10-13
Corteva Wetlands	3	2023-12-31
Dutch Slough	13	2022-10-11
Oakley	15	2024-10-12
Alvarado	10	1899-12-31	Historic
Bethel Island	5	1965-12-31	Historic
Browns Island	4	1991-08-18	Historic
Byron - other or unknown sites	6	1938-10-28	Historic
Peyton Marsh, Martinez	8	1998-12-31	Historic
Pleasanton Area	9	1910-12-31	Historic
Winter Island	7	1960-10-30	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.