Flora of North America species comparison

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Oenothera pallida subsp. pallida

Oenothera pallida subsp. latifolia
Photo is of parent taxon

pale evening-primrose
Photo is of parent taxon
Habit Herbs perennial, usually glabrous, sometimes strigillose, rarely sparsely villous; from a taproot, lateral roots producing adventitious shoots. Herbs perennial, densely strigillose throughout; from a taproot, lateral roots producing adventitious shoots.
Stems

usually branched throughout.

usually several, branched from base, sometimes unbranched.
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.

rosette not present at anthesis, 1–5(–7) × (0.4–)0.7–1.5 cm;

blade narrowly ovate to oblong-lanceolate or lanceolate, margins shallowly sinuate-dentate or denticulate.
Flowers

buds with free tips 0.5–2 mm;

floral tube 20–35 mm;

sepals 12–18 mm;

petals 12–25 mm.

buds with free tips 1–2 mm;

floral tube 15–40 mm;

sepals 12–30 mm;

petals 15–40 mm.
Capsules

spreading, contorted to curved.

spreading, straight or curved, sometimes contorted.
2n

= 14.

= 14.

Oenothera pallida subsp. pallida

Oenothera pallida subsp. latifolia
Phenology Flowering May–Sep. Flowering Jun–Sep.
Habitat Sandy soil, dunes, disturbed areas, alkaline soil. Open sites, sandy soil, dunes, rocky sites in grasslands.
Elevation 1100–2000 m. (3600–6600 ft.) 600–2000(–3100) m. (2000–6600(–10200) ft.)
Distribution
from FNA
AZ; CO; ID; NM; NV; OR; UT; WA; WY; BC
[BONAP county map]
from FNA
CO; KS; NE; NM; OK; SD; UT; WY
[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.)

Some collections from mostly disturbed sites in northern Utah (Cache, Salt Lake, Summit, and Tooele counties) have been identified as subsp. latifolia; it is not clear if they represent a disjunct distribution area of this subspecies, naturalized populations, or if they are pubescent forms of subsp. pallida.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10. FNA vol. 10.
Parent taxa Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Anogra > Oenothera pallida Onagraceae > subfam. Onagroideae > tribe Onagreae > Oenothera > sect. Anogra > Oenothera pallida
Sibling taxa
O. pallida subsp. latifolia, O. pallida subsp. runcinata, O. pallida subsp. trichocalyx
O. pallida subsp. pallida, O. pallida subsp. runcinata, O. pallida subsp. trichocalyx
Synonyms Anogra leptophylla, O. pallida var. idahoensis, O. pallida var. leptophylla O. pallida var. latifolia, Anogra cinerea, A. latifolia, A. pallida var. latifolia, O. latifolia
Name authority unknown (Rydberg) Munz in N. L. Britton et al.: N. Amer. Fl., ser. 2, 5: 119. (1965)
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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