Centromadia parryi subsp. congdonii

Congdon's tarplant

Family:Asteraceae

Rarity

CNPS-EB: *A2
State CNPS: 1B.1
Global Rank: G3T2
CNDDB Rank: S2

16 current natural populations

Criteria:

Limited/Threatened Habitat
N Limit

Observations

Key

Ecology

Flowers June - October

Habitats:

Alkali Areas
Grassland (Annual or Perennial)
Miscellaneous Wetlands

References

Synonyms

Hemizonia parryi subsp. congdonii

Populations

Key

Location	Pop ID	Last Recorded	Notes
Dublin - South of 580, West of 680	15	2021-10-01
Dublin, E of 680, N of 580	2	2002-08-07
Dublin, E of 680, N of 580	3	2019-12-31
Dublin, E of 680, N of 580	28	2023-08-11
Fremont Flatlands and Hills	24	2010-08-10
Hastings Slough	17	2011-06-23
Livermore - other or unknown sites	8	2011-06-20
Mt. Eden	25	2009-09-20
Newark	20	2003-11-07
Oakley	16	2010-07-29
Sunol Valley	14	2008-08-18
Tassajara Creek Area	27	2010-08-26
Tassajara Road	1	2002-12-31
Tassajara Road	4	2012-08-01
Tassajara Road	13	2008-09-18
Waterbird Park, Martinez	18	2010-08-13
Danville	6	1966-08-31	Historic
Danville	7	1998-12-31	Historic
Fremont Flatlands and Hills	21	1933-10-27	Historic
Newark	19	1958-08-09	Historic
Newark	23	1989-12-31	Historic
Norris Canyon	12		Historic
San Leandro Bay	26	1958-10-11	Historic
San Ramon, East of 680	5	1999-12-31	Historic
San Ramon, W of 680	9	1999-12-31	Historic
San Ramon, W of 680	10	1998-12-31	Historic
San Ramon, W of 680	11	1999-12-31	Historic
Warm Springs, Fremont	22	1999-07-22	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.