CNPS.ORG Inventory of Rare and Endangered Plants - 7th edition interface
v7-18mar 3-19-18
Status: record oenothera_deltoides_ssp._howellii - Mon, Dec. 6, 2021, 21:44 ET b
Oenothera deltoides ssp. howellii
common nameAntioch Dunes evening-primrose
CalPhotos image
more photos
Robert Potts © 2001 California Academy of Sciences  Follow image link for photo data.
life formperennial herb
CA Rare Plant Rank
List 1B.1
LIST 1B: Rare, threatened, or endangered in California and elsewhere.
     0.1: Seriously endangered in California
state rank
S1      ranking system key
global rank
G5T1      ranking system key
Where did the "RED" code go?
CA state listingEndangered  11/78
federal listingEndangered  04/26/78
where found
MAPS - Use v8 link below.

Topographic quads (5):
Brentwood (463B) 3712186, Clayton (464B) 3712188, Jersey Island (480C) 3812116, Honker Bay (481C) 3812118, Antioch North (481D) 3812117
quad data info

Counties, states, regions:
Contra Costa (CCA), Sacramento (SAC)
A reminder: Species not recorded for a given area may nonetheless be present, especially where favorable conditions occur.
CNPS habitats•Inland dunes (InDns)
blooming period Mar-Sep  
elevation range0 - 30 meters
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.
full nameOenothera deltoides Torr. & Frem. ssp. howellii (Munz) W. Klein
Version 8    INVENTORY VERSION 8 interface for this taxon, including GIS and more links

Additional information:
standard acronym  OEDEH Element Code  PDONA0C0B4
CalFlora species this taxon    CalFlora genus related taxa
Jepson Online Jepson Interchange  Jepson Manual and other resources
Google search
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Suggested citation: California Native Plant Society (CNPS). 2018. Inventory of Rare and Endangered Plants (online edition, v7-18mar). California Native Plant Society. Sacramento, CA. Accessed on Mon, Dec. 6, 2021 from

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