Ceanothus thyrsiflorus var. thyrsiflorus

blue blossom, California lilac

Family:Rhamnaceae

Rarity

CNPS-EB: B

10 current natural populations

Criteria:

Small Populations
Declining

Observations

Key

Ecology

Flowers March - June

Habitats:

Miscellaneous

All Ceanothus

C. leucodermis (A2)

C. thyrsiflorus var. thyrsiflorus

References

Synonyms

Ceanothus thyrsiflorus var. chandleri
Ceanothus thyrsiflorus var. repens

Populations

Key

Location	Pop ID	Last Recorded	Notes
Carquinez Strait Rgnl Park	3	2004-04-25
Huckleberry Rgnl Preserve	22	2021-05-02
Joaquin Miller Park, Oakland	5	2002-12-31
Redwood Rgnl Park	20	2019-04-28
Redwood Rgnl Park	23	2013-04-12
Tilden Rgnl Park - Jewel Lake/Nature area	19	2019-04-24
Tilden Rgnl Park - Jewel Lake/Nature area	25	2019-04-24
Wildcat Rgnl Park	16	2020-04-18
Wildcat Rgnl Park	18	2019-04-26
Wildcat Rgnl Park	24	2021-03-07
Chabot Rgnl Park	1	1990-12-31	Historic
Claremont Canyon Rgnl Park	2	1941-03-14	Historic
EBMUD land on San Pablo Ridge	12	1990-12-31	Historic
El Cerrito - other or unknown sites	4	1990-12-31	Historic
Emeryville	21	1990-12-31	Planted
Kensington	6	1990-12-31	Historic
Pt. Richmond Area	7	1984-12-31	Historic
Redwood Rgnl Park	8	1982-04-30	Historic
Redwood Rgnl Park	9	2003-04-18	Planted
San Francisco Bay National Wildlife Refuge	11	1999-12-31	Planted
Sibley Rgnl Park	10	2004-12-31	ID Uncertain
Strawberry Canyon	13	1933-05-29	Historic
Tilden Rgnl Park - other or unknown sites	14	1990-10-14	Historic
Wildcat Rgnl Park	15	1990-12-31	Historic
Wildcat Rgnl Park	17	1991-06-14	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.