Cephalanthus occidentalis

button bush

Family:Rubiaceae

Rarity

CNPS-EB: A2

5 current natural populations

Criteria:

Limited/Threatened Habitat
Small Populations

Observations

Key

Ecology

Habitats:

Miscellaneous Wetlands
Riparian

References

Populations

Key

Location	Pop ID	Last Recorded	Notes
Antioch Dunes	1	2022-07-14
Antioch Dunes	15	2023-06-21
Clifton Court Forebay - E of Byron	5	2022-07-22
Clifton Court Forebay - E of Byron	14	2022-07-22
Los Vaqueros Watershed	8	2020-11-21
Antioch - other or unknown sites	11	1929-12-31	Historic
Antioch Shoreline	2	1991-12-31	Historic
Browns Island	3	1991-08-18	Historic
Carquinez Strait Rgnl Park	9	1990-11-11	Historic
Corteva Wetlands	4	1991-10-20	Historic
Jersey Island	6	1993-12-31	Historic
Orwood Tract	7	1920-12-31	Historic
Rock Slough	13	1986-08-08	Historic
Shell Ridge	10	2009-07-09	Planted

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.