Oenothera rosea
Oenothera dodgeniana
pink evening primrose, rose evening-primrose
1–several, ascending to decumbent, 7–65 cm.
1 or few-branched from base, 50–120 cm.
in a basal rosette and cauline, basal 1–6 × 0.3–2 cm, blade narrowly elliptic to elliptic or ovate, margins subentire, weakly serrulate, or sinuate-pinnatifid;
cauline 1–6 × 0.3–2 cm, blade narrowly elliptic to narrowly ovate, margins subentire or weakly serrulate, proximal ones sinuate-pinnatifid.
in a basal rosette and cauline, basal 6–20 × 1–3 cm, blade lanceolate to narrowly elliptic;
cauline 5–10 × 1–2.5 cm, blade lanceolate to narrowly elliptic, margins subentire or repand-denticulate.
erect.
1–3 opening per day near sunrise;
buds with free tips 0.1–1 mm;
floral tube 4–8 mm;
sepals 6–12 mm;
petals rose purple, fading darker, 4–12 mm;
filaments 4–6 mm, anthers 2–3.5 mm, pollen 35–65% fertile;
style 7–13.5 mm, stigma surrounded by anthers at anthesis.
4-merous, zygomorphic, opening at sunset;
floral tube 10–11 mm;
sepals 11–15 mm;
petals white, fading pink, rhombic-obovate, 11–14 mm;
filaments 6.5–9 mm, anthers 2.5–4 mm, pollen 90–100% fertile;
style 22–28 mm, stigma exserted beyond anthers.
narrowly obovoid, 4–12 × 2–4 mm, apex attenuate to a sterile beak, proximal stipe 5–20 mm, gradually tapering to base, valve midrib prominent in distal part;
sessile.
ellipsoid or ovoid, sharply 4-angled, with deep furrows alternating with angles for 2–3 mm from apex, ribbed from base of furrow to base of fruit, 9–11 × 3–5 mm;
sessile.
narrowly obovoid, 0.5–0.9 × 0.3–0.5 mm.
2–4, yellowish to light brown, 2–3 mm.
= 14.
= 14.
Oenothera rosea
Oenothera dodgeniana
Oenothera rosea is a PTH species, forming a ring of 14 chromosomes in meiosis, and is self-compatible and autogamous. In the flora area, it is known from Cochise, Pima, and Santa Cruz counties in Arizona, Alameda, Los Angeles, Riverside, San Bernardino, San Diego, San Francisco, and Santa Barbara counties in California (primarily in urban areas), and from southern Texas. It is clearly of North American origin, since all of its close relatives are confined to North America, and has spread south along the Andes. It occurs at 500–3700 m in South America but generally at lower elevations in most areas.
The name Hartmannia affinis Spach is illegitimate, being based on Oenothera virgata; H. gauroides Spach is also illegitimate, being based on O. rosea; O. purpurea Lamarck is a later homonym; these three names pertain here.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Oenothera dodgeniana occurs in two disjunct areas: the western foothills of the San Juan Mountains in Archuleta and Huerfano counties, Colorado, and Rio Arriba County, New Mexico; and Sierra Blanca and Sacramento Mountains in Lincoln and Otero counties, south-central New Mexico. The species was collected once at Durango, La Plata County, Colorado (P. H. Raven and D. P. Gregory 1972[1973]), but has not since been recollected. Oenothera dodgeniana and O. coloradensis were considered by Raven and Gregory to represent a relict species along the eastern flank of the Rocky Mountains that arose from more widespread species farther to the east, such as O. filiformis. Oenothera dodgeniana belongs to a subclade which is sister to that containing O. coloradensis, and within that subclade is sister to O. demareei and O. lindheimeri (W. L. Wagner et al. 2013). Although O. dodgeniana is fairly closely related to O. coloradensis, the two taxa seem to have had independent origins that have led to distributions along the eastern flank of the Rocky Mountains. Oenothera dodgeniana is self-compatible (Raven and Gregory).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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