Mentzelia affinis

hydra stick-leaf

Family:Loasaceae

Rarity

CNPS-EB: B

8 current natural populations

Criteria:

N Limit
W Limit

Observations

CNPS-EB Database ⓘ
Calflora (group) ⓘ
Calflora (public)
iNaturalist
- Genus Mentzelia
- Mentzelia affinis
CCH2

Key

Ecology

Flowers April - May

Habitats:

Grassland (Annual or Perennial)
Sand, Sandstone
Woodland

All Mentzelia

References

Populations

Key

Location	Pop ID	Last Recorded	Notes
Black Diamond - Nortonville	2	2022-02-27
Black Diamond - Stewartsville	12	2021-04-01
Black Diamond Rgnl Preserve	10	2004-03-28
Black Diamond Rgnl Preserve	11	2022-12-31
Black Diamond Rgnl Preserve	14	2024-03-24
Contra Loma Rgnl Park	6	2022-02-20
Lawrence Livermore Lab, Site 300, Corral Hollow	13	2021-12-31
Patterson Pass	8	2004-03-12
Altamont Pass	1	1994-05-16	Historic
Byron Hot Springs area	3	1930-12-31	Historic
Corral Hollow Area	4	1993-04-17	Historic
Corral Hollow Area	5	1993-04-17	Historic
Maguire Peaks, Sunol Regional Wilderness	9	1993-04-06	Historic
Ohlone Rgnl Wilderness	7	1991-05-20	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.