Oenothera pubescens
Oenothera dodgeniana
pubescent evening primrose, silky evening primrose, South American evening-primrose
unbranched or with branched central stem and ascending to decumbent lateral branches arising from rosette, 5–50(–80) cm.
1 or few-branched from base, 50–120 cm.
in a basal rosette and cauline, basal 5–14 × 0.5–2.5 cm, cauline 2–8 × 0.5–2.5 cm;
blade narrowly oblanceolate to narrowly elliptic or narrowly oblong, margins usually dentate to deeply lobed;
bracts spreading, flat.
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.
usually 1 opening per day near sunset;
buds with free tips erect, 0.1–1 mm;
floral tube erect, becoming recurved and nodding, then erect again just before anthesis, 15–50 mm;
sepals 5–25 mm;
petals yellow, fading reddish orange, broadly obovate to obcordate, 5–25(–35) mm;
filaments 6–18 mm, anthers (2–)3–9 mm, pollen ca. 50% fertile;
style 20–60 mm, stigma surrounded by or slightly exserted beyond 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.
cylindrical, sometimes slightly enlarged distally, 20–45 ×2–4 mm.
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.
brown, sometimes dark-flecked, 0.9–1.5 × 0.6–1 mm.
2–4, yellowish to light brown, 2–3 mm.
= 14.
= 14.
Oenothera pubescens
Oenothera dodgeniana
Oenothera pubescens is a PTH species and forms a ring of 14 chromosomes in meiosis, and is self-compatible and autogamous (W. Dietrich and W. L. Wagner 1988).
Oenothera pubescens has been collected once in California in 1884 (Newberry Springs, San Bernardino County), where it was temporarily introduced or a natural occurrence that was extirpated. Collections from west Texas (Brewster, Jeff Davis, and Presidio counties) have been made since 1990 and a few others collected earlier were misidentified as O. laciniata.
(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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