Oenothera laciniata
Oenothera triangulata
cut-leaf evening-primrose, southern evening primrose
prairie beeblossom
erect to ascending, unbranched to much branched, 5–50 cm.
ascending, usually well-branched from base and distally, rarely unbranched, 15–60 cm.
in a basal rosette and cauline, basal 4–15 × 1–3 cm, cauline 2–10 × 0.5–3.5 cm;
blade green, narrowly oblanceolate to narrowly elliptic or narrowly oblong, margins usually dentate or deeply lobed;
bracts spreading, flat.
in a basal rosette and cauline, 1.5–8 × 0.2–0.6(–1.5) cm, blade very narrowly elliptic to oblanceolate or oblong-elliptic, margins entire or weakly sinuate-dentate.
usually 1 opening per day near sunset;
buds erect, with free tips erect, 0.3–3 mm;
floral tube 12–35 mm;
sepals 5–15 mm;
petals yellow, fading orange or reddish tinged, broadly obovate or obcordate, 5–22 mm;
filaments 3–14 mm, anthers 4–5 mm, pollen ca. 50% fertile;
style 20–50 mm, stigma surrounded by anthers at anthesis.
3(or 4)-merous, zygomorphic, opening at sunset;
floral tube 4–5.5 mm;
sepals 4.5–6 mm;
petals white, fading pink, elliptic-obovate, 3.5–5 mm;
filaments 2–3.5 mm, anthers 1.5–3 mm, pollen 35–65% fertile;
style 9–10 mm, stigma surrounded by anthers.
cylindrical, sometimes slightly enlarged toward apex, 20–50 × 2–4 mm.
narrowly obovoid, 3(or 4)-winged, furrowed between wings, 7–9 × 3–5 mm, narrowed at base;
sessile.
ellipsoid to subglobose, 0.9–1.8 × 0.4–0.9 mm.
(1 or)2–5, yellowishto light brown, 1.5–3.5 × 1–1.5 mm.
= 14.
= 14.
Oenothera laciniata
Oenothera triangulata
Oenothera laciniata is a PTH species and forms aring of 14 chromosomes in meiosis, and is self-compatible and autogamous (W. Dietrich and W. L. Wagner 1988).
Oenothera laciniata is known in New Mexico from Doña Ana and Roosevelt counties from non-montane habitats and thus do not appear to represent O. pubescens; however, a few collections from Brewster and Jeff Davis counties, Texas, reported by W. Dietrich and W. L. Wagner (1988) as O. laciniata appear to represent collections of O. pubescens. Dietrich and Wagner found that O. laciniata hybridizes not only with O. grandis, but also with O. drummondii subsp. drummondii, O. humifusa, and O. mexicana. It is naturalized nearly worldwide in temperate and subtropical areas.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Oenothera triangulata is a PTH species and forms a ring of 14 chromosomes in meiosis. The species is self-compatible and autogamous (P. H. Raven and D. P. Gregory 1972[1973]). It may have been derived from hybridization between O. patriciae and O. suffulta. The species has a relatively narrow distribution across south-central Oklahoma and north-central Texas (Oklahoma in Cleveland, Comanche, Cotton, Grady, Oklahoma, Rogers, Stephens, and Tulsa counties; Texas in Archer, Baylor, Callahan, Clay, Coleman, Crosby, Eastland, Erath, Jones, Montague, Taylor, Throckmorton, Tom Greene, Wichita, Wilbarger, and Young counties).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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