Hemizonia congesta subsp. lutescens

hayfield tarweed

Family:Asteraceae

Rarity

CNPS-EB: B

8 current natural populations

Criteria:

S Limit

Observations

Key

Ecology

Flowers April - December

Habitats:

Grassland (Annual or Perennial)
Serpentine or Serpentine-derived soils

References

Synonyms

Hemizonia lutescens

Populations

Key

Location	Pop ID	Last Recorded	Notes
Pinole - EBMUD land nearby	9	2008-12-31
Pt. Pinole Rgnl Park	7	2021-08-15
Pt. Pinole Rgnl Park	15	2019-09-01
Pt. Pinole Rgnl Park	16	2023-10-15
Sand Creek	11	2002-12-31
Siesta Valley, Upper - EBMUD land	8	2017-09-25
Springtown Wetlands Preserve	10	2017-06-04
Wildcat Rgnl Park	6	2006-10-02
Antioch Dunes	1	1985-09-02	Historic
Bishop Ranch Rgnl Park	12	1993-08-08	ID Uncertain
Briones Rgnl Park	2	1999-12-31	Historic
Carquinez Strait Rgnl Park	3	1995-12-31	Historic
Garin/Dry Creek Rgnl Park - unknown which park	14	1999-12-31	ID Uncertain
Knowland Park, Oakland	4	1996-12-31	Historic
Las Trampas Rgnl Wilderness	13	1990-12-31	ID Uncertain
Norris Canyon	5	1976-12-31	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.