Flora of North America species comparison

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Oenothera pallida subsp. trichocalyx

Oenothera pallida subsp. latifolia
Photo is of parent taxon
Photo is of parent taxon
Habit Herbs usually annual, sometimes perennial, strigillose throughout and villous distally, especially on flower parts; from a taproot, when perennial sometimes lateral roots producing adventitious shoots. Herbs perennial, densely strigillose throughout; from a taproot, lateral roots producing adventitious shoots.
Stems

single to several from base, usually unbranched.

usually several, branched from base, sometimes unbranched.
Leaves

basal rosette usually present at anthesis, 3–5(–7.8) × 0.4–0.8(–1.2) cm;

blade narrowly lanceolate to oblong, margins pinnatifid or dentate.

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 0–0.2 mm;

floral tube 20–30 mm;

sepals 10–18 mm;

petals 10–20 mm.

buds with free tips 1–2 mm;

floral tube 15–40 mm;

sepals 12–30 mm;

petals 15–40 mm.
Capsules

spreading to reflexed, straight or contorted.

spreading, straight or curved, sometimes contorted.
2n

= 14.

= 14.

Oenothera pallida subsp. trichocalyx

Oenothera pallida subsp. latifolia
Phenology Flowering (Apr–)May–Jun. Flowering Jun–Sep.
Habitat Sandy, silty, or rocky soil in pinyon-juniper woodlands or shrublands, with Artemisia and Ericameria. Open sites, sandy soil, dunes, rocky sites in grasslands.
Elevation 1100–2500 m. (3600–8200 ft.) 600–2000(–3100) m. (2000–6600(–10200) ft.)
Distribution
from FNA
AZ; CO; NM; UT; WY
[BONAP county map]
from FNA
CO; KS; NE; NM; OK; SD; UT; WY
[BONAP county map]
Discussion

Subspecies trichocalyx occurs across central to southern Wyoming, eastern Utah, western Colorado, northeastern Arizona, and northwestern New Mexico. Within its range it has slight overlap with subspp. pallida and runcinata. In its purest form, subsp. trichocalyx is the most distinctive phase of Oenothera pallida, but many of the populations have characteristics that approach other subspecies with perennial habit (versus annual) appearing occasionally. Plants that are glabrous, or nearly so, like subsp. pallida, but with apparent short-duration habit and divided leaves like subsp. trichocalyx, occur in southern Wyoming and in the Uinta Basin region of Utah; only more typical plants of subsp. trichocalyx otherwise occur in the region without any current evidence of the presence of subsp. pallida.

(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. pallida, O. pallida subsp. runcinata
O. pallida subsp. pallida, O. pallida subsp. runcinata, O. pallida subsp. trichocalyx
Synonyms O. trichocalyx, Anogra rhizomata, A. trichocalyx, A. violacea, A. vreelandii, O. albicaulis var. trichocalyx, O. pallida var. trichocalyx O. pallida var. latifolia, Anogra cinerea, A. latifolia, A. pallida var. latifolia, O. latifolia
Name authority (Nuttall) Munz & W. M. Klein in N. L. Britton et al.: N. Amer. Fl., ser. 2, 5: 119. (1965) (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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