Heterotheca sessiliflora subsp. bolanderi

Rarity

CNPS-EB: C

14 current natural populations

Criteria:

E Limit
Small Populations

Observations

Key

Ecology

Flowers June - September

Habitats:

Coastal Bluff
Sand, Sandstone
Scrub (Coastal or Interior)

All Heterotheca

H. oregona var. rudis (A1)
H. oregona var. scaberrima (A1)
H. sessiliflora subsp. bolanderi
H. sessiliflora var. bolanderioides (A1x)

References

Synonyms

Heterotheca echioides var. bolanderi

Populations

Key

Location	Pop ID	Last Recorded	Notes
Alamo	24	2008-08-29
Albany Hill	7	2023-07-04
Black Diamond - Nortonville	1	2002-05-10
Black Diamond - Nortonville	2	2002-05-10
Brushy Peak - EBRPD	33	2021-03-05
Chabot Rgnl Park	21	2002-05-11
Concord Naval Weapons Station	25	2008-12-31
Joaquin Miller Park, Oakland	34	2011-08-31
Las Trampas Rgnl Wilderness	35	2025-01-25
San Francisco Water District land, Sunol	22	2004-07-02
San Francisco Water District land, Sunol	23	2004-06-07
San Francisco Water District land, Sunol	26	2009-12-31
Siesta Valley, Upper - EBMUD land	27	2017-12-31
Tilden Rgnl Park - San Pablo Ridge	19	2011-08-13
Altamont Pass	9	1994-05-16	Historic
Antioch - other or unknown sites	10	1996-03-23	Historic
Briones Reservoir, EBMUD	11	1998-12-31	Historic
Brushy Peak Rgnl Park - LARPD	12	1997-12-31	Historic
Claremont Canyon Rgnl Park	5	1997-03-16	Historic
Clayton Ranch - SE of Clayton, EBRPD	13	1999-12-31	Historic
Garin Rgnl Park	14	1997-03-06	Historic
Gateway area	29	1990-12-31	ID Uncertain
Kensington	30	1999-12-31	ID Uncertain
Lime Ridge area	31	1990-12-31	ID Uncertain
Miller - Knox Rgnl Park	8	1999-12-31	Historic
Moraga - other or unknown sites	32	1990-12-31	ID Uncertain
Mt. Diablo State Park - South side	28	1994-04-27	ID Uncertain
Oakland Hills - North	3	1990-12-31	ID Uncertain
Pittsburg Hills	15	1997-09-02	Historic
Redwood Rgnl Park	6	1981-06-30	Historic
Rocky Ridge - EBMUD land near Las Trampas	16	1999-10-09	Historic
Sibley Rgnl Park	17	1991-12-31	Historic
Strawberry Canyon	4	1999-12-31	Historic
Tilden Rgnl Park - other or unknown sites	18	1997-12-31	Historic
Walpert Ridge	20	1997-05-31	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.