Erigeron petrophilus var. petrophilus

rock daisy

Family:Asteraceae

Rarity

CNPS-EB: B

9 current natural populations

Criteria:

Small Populations
Declining

Observations

Key

Ecology

Flowers May - September

Habitats:

Rock, Tallus, Scree
Serpentine or Serpentine-derived soils

All Erigeron

E. petrophilus var. petrophilus
E. philadelphicus var. philadelphicus (C)
E. reductus var. angustatus (A1)

References

Populations

Key

Location	Pop ID	Last Recorded	Notes
Mines Road/Arryo Mocho	15	2024-05-29
Mt. Diablo State Park - South side	1	2022-06-17
Mt. Diablo State Park - South side	2	2008-12-31
Mt. Diablo State Park - South side	14	2022-04-02
Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo	4	2009-06-16
Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo	5	2022-06-17
Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo	6	2022-05-12
Siesta Valley, Lower - EBMUD land	13	2016-07-08
Tilden Rgnl Park - Lake Anza	10	2003-12-31
Las Trampas Rgnl Wilderness	7	1991-06-06	Historic
Las Trampas Rgnl Wilderness	8	1969-10-22	Historic
Morgan Territory Rgnl Park	9	1991-12-14	Historic
Mt. Diablo State Park - South side	3	1930-12-31	Historic
Sibley Rgnl Park	12	1993-12-31	Historic
Wildcat Creek	11	1936-12-31	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.