Cirsium quercetorum

brownie thistle

Family:Asteraceae

Rarity

CNPS-EB: A2

7 current natural populations

Criteria:

Narrow Range in ALA & CCA
Small Populations
Declining

Observations

CNPS-EB Database ⓘ
Calflora (group) ⓘ
Calflora (public)
iNaturalist
- Genus Cirsium
- Cirsium quercetorum
CCH2

Key

Ecology

Flowers April - August

Habitats:

Grassland (Annual or Perennial)
Woodland

All Cirsium

References

Synonyms

Cirsium quercetorum var. walkerianum
Cirsium quercetorum var. xerolepis
Cirsium walkerianum

Populations

Key

Location	Pop ID	Last Recorded	Notes
Brooks Island Rgnl Park	3	2005-12-31
Leona Heights Rgnl Park, or nearby	17	2024-04-14
Redwood Rgnl Park	16	2019-10-04
Siesta Valley, Upper - EBMUD land	14	2018-03-24
Skyline Serpentine Prairie, Redwood Rgnl Park	12	2010-07-20
Tilden Rgnl Park - San Pablo Ridge	13	2010-12-31
Tilden Rgnl Park - San Pablo Ridge	15	2022-06-04
Berkeley - other or unknown sites	1	1917-12-31	Historic
Berkeley Hills	2	1896-12-31	Historic
Concord - other or unknown sites	4	1954-05-10	Historic
El Cerrito Hills	5	1933-12-31	Historic
Gateway area, EBMUD land	6	1999-12-31	Historic
Grizzly Peak - other or unknown sites	7	1938-12-31	Historic
Miller - Knox Rgnl Park	8	1975-12-31	Historic
Oakland Hills - North	9	1954-12-31	Historic
Pt. Isabel Rgnl Park	10	1897-12-31	Historic
Pt. Molate	11	1998-12-31	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.