Allenrolfea occidentalis

Rarity

CNPS-EB: B-PV

18 current natural populations

Criteria:

Limited/Threatened Habitat
Narrow Range in ALA & CCA
N Limit
W Limit

Observations

Key

Ecology

Flowers June - August

Habitats:

Alkali Areas

References

Populations

Key

Location	Pop ID	Last Recorded	Notes
Altamont Pass	1	2018-02-22
Byron - other or unknown sites	9	2018-04-10
Byron - other or unknown sites	20	2018-04-10
Byron - other or unknown sites	21	2018-04-10
Byron Hot Springs area	4	2022-03-14
Byron Hot Springs area	5	2007-05-01
Byron Hot Springs area	19	2018-02-22
Clifton Court Forebay - E of Byron	10	2018-04-10
Discovery Bay	6	2018-04-10
Garaventa Wetlands Preserve	24	2024-04-28
Livermore - other or unknown sites	12	2002-12-31
Livermore Valley	13	2018-02-22
Los Vaqueros Watershed	11	2021-12-05
Los Vaqueros Watershed	22	2022-02-12
Springtown Wetlands Preserve	15	2018-02-22
Springtown Wetlands Preserve Area	16	2002-12-31
Vasco Hills	18	2016-03-20
Vasco Hills	23	2022-03-14
Big Break, Antioch	2	1993-01-07	Historic
Briones Valley - W of Brentwood	3	1999-12-31	Historic
Byron - other or unknown sites	7	1996-04-11	Historic
Byron - other or unknown sites	8	1996-04-11	Historic
Old River	14	1930-12-31	Historic
Vasco Road, South - ALA Co	17	1982-12-31	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.