Hydrophyllum occidentale

western waterleaf

Family:Hydrophyllaceae

Rarity

CNPS-EB: A1

4 current natural populations

Criteria:

Narrow Range in ALA & CCA
Disjunct
Small Populations

Observations

CNPS-EB Database ⓘ
Calflora (group) ⓘ
Calflora (public)
iNaturalist
- Genus Hydrophyllum
- Hydrophyllum occidentale
CCH2

Key

Ecology

Flowers May - July

Habitats:

Chaparral
Miscellaneous
Riparian
Woodland

References

Synonyms

Hydrophyllum macrophyllum var. occidentale
Hydrophyllum occidentale var. watsonii
Hydrophyllum speciosum
Hydrophyllum watsonii

Populations

Key

Location	Pop ID	Last Recorded	Notes
Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo	1	2025-04-28
Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo	3	2022-03-27
Mt. Diablo State Park - Summit and Upper area - 2500 ft and abo	4	2025-05-28
Ohlone Rgnl Wilderness	8	2013-12-31
Man Ridge, Mines Rd.	7	1985-12-31	Historic
Mines Road/Arryo Mocho	6	1903-12-31	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.