Species Details

Oenothera deltoides ssp. howellii

Antioch Dunes evening-primrose

Download Report Calflora eFlora CCH CalPhotos

Classification

Scientific Name: Oenothera deltoides Torr. & Frem. ssp. howellii (Munz) W. Klein
Common Name: Antioch Dunes evening-primrose
Family:	Onagraceae
Element Code:	PDONA0C0B4
USDA Plants Symbol:	OEDEH
Synonyms/Other Names:

Conservation Status

CA Rare Plant Rank:	1B.1
Fed List:	FE (1978-05-27)
State List:	CE (1978-11-01)
Global Rank:	G5T1
State Rank:	S1
Other Status:	SB_CalBG/RSABG; SB_UCBG
CRPR Changes:
Add Date:	1974-01-01
Date Edited:	2023-06-06

Ecology and Life History

Lifeform: perennial herb

Blooming Period: Mar-Sep

Elevation:
0 - 30 meters
0 - 100 feet

General Habitats:

Inland dunes

Microhabitat Details:

Microhabitat:

Notes

Notes: Occurrences from SAC Co. (480C) and CCA Co. (481C) are introduced. Seriously threatened by mining, agriculture, industrial development, and non-native plants. Recovery work in progress. Protected in part at Antioch Dunes NWR (USFWS). See Aliso 2:81 (1949) for original description, Four Seasons 3(1):2-4 (1969) for threat information, and Biological Conservation 65:257-278 (1993) for population biology.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	7
	Total EOs	% of EOs
EOs with Threat Listed:	6	60 %
Non-native plant impacts	4	40%
Other	2	20%
Development	2	20%
Mining	2	20%
Biocides	1	10%
Foot traffic/trampling	1	10%
Recreational use (non-ORV)	1	10%

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					10
A	B	C	D	X	U
0	0	4	1	1	4

Occurrence Status:
Historical >20 Years	6
Recent <=20 Years	4

Presence:
Presumed Extant	9
Possibly Extirpated	1
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Contra Costa (CCA), Sacramento (SAC)

Quads: Name (Quad Code)
Antioch North (3812117), Brentwood (3712186), Clayton (3712188), Honker Bay (3812118), Jersey Island (3812116), Walnut Creek (3712281)

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

Presumed Extant

Click on quad for name. Hold Shift Key to use mouse scroll wheel

Selected References

Other:	Recovery Plan for Oenothera deltoides ssp. howellii (Antioch Dunes evening-primrose) (1984)
Other:	Recovery Plan Amendment for Oenothera deltoides ssp. howellii (Antioch Dunes evening-primrose) (1984)
Other:	Critical habitat for Oenothera deltoides ssp. howellii