Oenothera neomexicana
Oenothera grandiflora
New Mexico evening-primrose
large-flower evening-primrose
erect or ascending, unbranched or branched, 30–60 cm.
erect, red on proximal parts, usually green on distal ones, rarely red throughout, unbranched or with branches obliquely arising from rosette and secondary branches arising from main stem, 100–300(–400) cm.
in a basal rosette and cauline, rosette weakly developed or absent, at least during flowering, 3–9 × (0.6–)1–2.5 cm;
petiole 0–2 cm;
blade oblong to lanceolate or narrowly ovate, margins irregularly sinuate-dentate.
in a basal rosette and cauline, basal 18–32 × (2–)3–6.5 cm, cauline 6–20 × 1.5–6.5 cm;
blade soft and thin, bright green, usually flat, rarely undulate, narrowly oblanceolate to narrowly obovate, or narrowly elliptic to elliptic, sometimes narrowly ovate distally, margins bluntly dentate or subentire, teeth widely spaced, sometimes sinuate-dentate proximally or lobed;
bracts usually caducous.
erect, often with secondary or tertiary branches just proximal to main one.
1–several opening per day near sunset;
buds nodding, weakly quadrangular, with free tips 0.5–4 mm;
floral tube 30–50 mm;
sepals 20–30 mm, not spotted;
petals white, fading pink, broadly obovate, 20–30 mm;
filaments 10–15 mm, anthers 8–15 mm;
style 50–70 mm, stigma exserted beyond anthers at anthesis.
opening near sunset;
buds erect, 5–9 mm diam., with free tips terminal, erect, 2–9 mm;
floral tube 35–55 mm;
sepals yellowish green or flushed with red, 22–46 mm;
petals yellow to pale yellow, fading pale yellowish white, very broadly obcordate or obovate, (25–)30–45 mm;
filaments 18–27 mm, anthers 10–15 mm, pollen 90–100% fertile;
style 57–90 mm, stigma exserted beyond anthers at anthesis.
erect or strongly ascending, not woody, straight or slightly curved, subcylindrical, obtusely 4-angled, tapering gradually from base to apex, 20–30 × 2–3 mm;
sessile.
erect or slightly spreading, dull green when dry, narrowly lanceoloid to narrowly ovoid, 15–35 × 3.5–5.5 mm, free tips of valves 0.5–2.5 mm.
numerous, in 1 row per locule, dark brown, narrowly obovoid, 1.5 mm.
1–1.7 × 0.6–1.2 mm.
= 14.
= 14.
Oenothera neomexicana
Oenothera grandiflora
Oenothera neomexicana is known from central to western New Mexico west of the Rio Grande Valley, except for the Organ Mountains, and eastern and central Arizona from the White Mountains south to Mount Graham and northwestward across the Mogollon Rim in Coconino and Yavapai counties. Oenothera neomexicana had been assumed to be self-incompatible (W. L. Wagner et al. 2007), but K. E. Theiss et al. (2010) determined one population sampled to be consistently self-compatible.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Oenothera grandiflora has a scattered distribution, from the eastern half of Mississippi and Alabama, east to Tennessee (Franklin and Marion counties), North Carolina (Cherokee, Macon, Martin, Moore, New Hanover, Sampson, and Swain counties), South Carolina (Oconee, Spartanburg, and Sumter counties), and Florida (Alachua, Escambia, Franklin, Lake, Leon, Polk, Putnam, and Santa Rosa counties). Collections from southern Canada, New York, Pennsylvania, Vermont, and West Virginia almost certainly represent cultivated plants, garden escapes, or adventive populations, and the single locality from central Kentucky also may be an introduction; it is sometimes a colonizer in disturbed sites such as along roads.
Oenothera grandiflora has plastome III and a BB genome composition. As summarized by W. Dietrich et al. (1997), some populations of O. grandiflora seem to be entirely or mostly composed of self-incompatible individuals, whereas others consist of self-compatible plants. This is an extremely uncommon phenomenon within a single species of Oenothera; the only other species known to exhibit mixed populations of self-incompatible and self-compatible individuals is O. primiveris.
Oenothera grandiflora Lamarck 1798, being a later homonym of O. grandiflora L’Héritier 1789, pertains here.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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