Flora of North America species comparison

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Oenothera deltoides subsp. howellii
Photo is of parent taxon

Antioch dunes evening primrose
Habit Herbs perennial, densely strigillose, also villous and glandular puberulent distally; with relatively long, fleshy roots, grayish.
Stems

erect or ascending, several from base, not thickened near base, with numerous shorter lateral branches, these not encircling stems in older plants, 40–80 cm.
Leaves

cauline, without clear basal rosette, at least at anthesis;

blade lanceolate, margins runcinate-pinnatifid.
Flowers

buds fluted in distal 1/2, with free tips 1–9 mm;

sepals 20–30 mm;

petals 20–40 mm.
Capsules

45–60 × 3–4 mm.
2n

= 14.

Oenothera deltoides subsp. howellii
Phenology Flowering (Mar–)Jun–Jul(–Sep).
Habitat Sand dunes and bluffs.
Elevation 0–30 m. (0–100 ft.)
Distribution
from FNA
CA
[BONAP county map]
Discussion

W. M. Klein (1964) determined subsp. howellii to be self-incompatible.

Subspecies howellii is known from the Antioch Dunes in Contra Costa County. Subspecies howellii is federally listed as endangered and is in the Center for Plant Conservation’s National Collection of Endangered Plants.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Anogra > Oenothera deltoides
Sibling taxa
O. deltoides subsp. ambigua, O. deltoides subsp. cognata, O. deltoides subsp. deltoides, O. deltoides subsp. piperi
Synonyms O. deltoides var. howellii
Name authority (Munz) W. M. Klein: Aliso 5: 180. (1962)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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