Holocarpha obconica

San Joaquin tarplant

Family:Asteraceae

Rarity

CNPS-EB: B

8 current natural populations

Criteria:

W Limit

Observations

Key

Ecology

Flowers April - November

Habitats:

Grassland (Annual or Perennial)

All Holocarpha

H. macradenia (*A1)
H. obconica

References

Synonyms

Holocarpha obconica subsp. autumnalis

Populations

Key

Location	Pop ID	Last Recorded	Notes
Corral Hollow Area	14	2021-09-18
Lawrence Livermore Lab, Site 300, Corral Hollow	13	2021-12-31
Los Vaqueros Watershed	2	2017-09-30
Los Vaqueros Watershed	8	2020-11-21
Marsh Creek State Park - formerly Cowell Ranch	6	2003-12-31
Round Valley Rgnl Park	15	2021-05-23
Round Valley Rgnl Park	16	2023-09-10
Round Valley Rgnl Park	17	2023-06-08
Altamont Pass	1	2000-10-14	Historic
Byron - other or unknown sites	3	1933-10-27	Historic
Byron - other or unknown sites	4	1959-09-06	Historic
Deer Valley	7	1933-11-02	Historic
Del Valle Regional Park	12	1999-12-31	Historic
Marsh Creek Road	5	2000-10-01	Historic
Morgan Territory Rgnl Park	9	1990-07-08	Historic
Patterson Pass	11	2000-10-14	Historic
Springtown Wetlands Preserve	10	1991-06-23	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.