Flora of North America species comparison

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Oenothera pallida subsp. pallida
Photo is of parent taxon

pale evening-primrose
Habit Herbs perennial, usually glabrous, sometimes strigillose, rarely sparsely villous; from a taproot, lateral roots producing adventitious shoots.
Stems

usually branched throughout.
Leaves

rosette not present at anthesis, 2–6 × 0.3–0.8(–1) cm;

blade lanceolate to linear-lanceolate or oblong, margins usually subentireor remotely denticulate, rarely pinnatifid, usually repand.
Flowers

buds with free tips 0.5–2 mm;

floral tube 20–35 mm;

sepals 12–18 mm;

petals 12–25 mm.
Capsules

spreading, contorted to curved.
2n

= 14.

Oenothera pallida subsp. pallida
Phenology Flowering May–Sep.
Habitat Sandy soil, dunes, disturbed areas, alkaline soil.
Elevation 1100–2000 m. (3600–6600 ft.)
Distribution
from FNA
AZ; CO; ID; NM; NV; OR; UT; WA; WY; BC
[BONAP county map]
Discussion

The distribution of subsp. pallida centers in the intermountain region from Oregon and Washington east of the mountains, adjacent southern British Columbia, south through southern Idaho, Wyoming, western half of Utah, southern Nevada, to northern Arizona, northwestern New Mexico, and adjacent southwestern Colorado. There are morphological intermediates with subspp. runcinata and trichocalyx. Densely strigillose plants occur within the range of subsp. pallida, especially near the St. Anthony Dunes in Idaho, and have been referred to as var. idahoensis.

Baumannia douglasiana Spach is an illegitimate name that pertains here.

(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 pallida
Sibling taxa
O. pallida subsp. latifolia, O. pallida subsp. runcinata, O. pallida subsp. trichocalyx
Synonyms Anogra leptophylla, O. pallida var. idahoensis, O. pallida var. leptophylla
Name authority unknown
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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