Taxon Details

Oenothera deltoides ssp. julpunensis

Bay Miwok evening primrose

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Taxon Summary:

Oenothera deltoides ssp. julpunensis, commonly known as Bay Miwok evening primrose, is a annual/perennial herb in the Onagraceae that is found only in California. It occurs within Inland dunes, growing at elevations from 5 to 15 meters. Oenothera deltoides ssp. julpunensis is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification

Scientific Name: Oenothera deltoides Torr. & Frém. ssp. julpunensis S.F. Jones
Common Name: Bay Miwok evening primrose
Family:	Onagraceae
Element Code:	PDONA0C0B5
USDA Plants Symbol:
Synonyms/Other Names:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.1
Fed List:	None
State List:	None
Global Rank:	G5T1
State Rank:	S1
Other Status:
CRPR Changes: added to 1B.1 on 2025-04-29
Add Date:	2025-04-29
Date Edited:	2025-06-03

Ecology and Life History

Lifeform: annual/perennial herb

Blooming Period: Apr-Jun

Elevation:
5 - 15 meters
15 - 50 feet

General Habitats:

Inland dunes

Microhabitat Details: Endemic to the loose sandy soils of the eastern edge of the Antioch Dunes sand sheet.

Microhabitat:

Openings
Sandy

Notes

Notes:
Threats: Threatened by development, urbanization, and agriculture.
Taxonomy: Populations included in ssp. julpunensis were previously assigned to O. deltoides ssp. cognata or thought to be morphological intergrades (or hybrids) between ssp. cognata and ssp. howellii.

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	0
	Total EOs	% of EOs
EOs with Threat Listed:	0	0 %

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					0
A	B	C	D	X	U
0	0	0	0	0	0

Occurrence Status:
Historical >20 Years	0
Recent <=20 Years	0

Presence:
Presumed Extant	0
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)

Quads: Name (Quad Code)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Location Data is Forthcoming from the CNDDB

Presumed Extant

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CNPS Status Review:	Proposed addition to CRPR 1B.1, G1 / S1 (2025)
Original Description:	Madroño 71(2): 84-104 (2024)

CNPS Rare Plant Inventory