Bidens frondosa

sticktight

Family:Asteraceae

Rarity

CNPS-EB: B

8 current natural populations

Criteria:

Limited/Threatened Habitat

Observations

Key

Ecology

Flowers June - October

Habitats:

Riparian
Miscellaneous Wetlands

All Bidens

B. frondosa
B. laevis (A2)

References

Populations

Key

Location	Pop ID	Last Recorded	Notes
Brooks Island Rgnl Park	2	2005-12-31
Concord Naval Weapons Station	6	2008-12-31
Dutch Slough	17	2023-10-11
Fremont Flatlands and Hills	18	2022-09-23
San Francisco Water District land, Sunol	13	2009-12-31
San Pablo Reservoir - EBMUD	15	2005-08-19
San Pablo Reservoir - EBMUD	19	2023-09-30
San Pablo Reservoir - EBMUD	20	2024-10-19
Bethel Island	3	1998-12-31	Historic
Brentwood area	1	1963-12-31	Historic
Browns Island	4	1979-12-31	Historic
Byron - other or unknown sites	5	1929-12-31	Historic
Contra Loma Rgnl Park	7	1978-12-31	Historic
Coyote Hills Rgnl Park	8	1997-07-24	Historic
Frank's Tract	9	1990-09-16	Historic
Niles Canyon area	10	2000-11-30	Historic
Peyton Marsh, Martinez	12	1998-12-31	Historic
Pt. Richmond Area	11	1999-12-31	Historic
San Leandro Bay	14	1958-12-31	Historic
Webb Tract	16	1988-08-30	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.