6. Oenothera laciniata Hill, Veg. Syst. 12, App.: 64. 1767.
裂叶月见草 lie ye yue jian cao
Raimannia laciniata (Hill) Rose ex Britton & A. Brown.
Herbs erect to procumbent, annual or short-lived perennial, usually with basal rosette. Stems 5-50(-100) cm tall, simple or branched, strigillose and often villous, often with glandular hairs on inflorescence. Leaves green, with inconspicuous veins, strigillose and villous, often also glandular puberulous, sessile to shortly petiolate; rosette blade 4-15 × 1-3 cm; cauline blade narrowly oblanceolate to lanceolate or narrowly elliptic, 2-10 × 0.5-3.5 cm, base narrowly cuneate, margin deeply lobed to dentate, apex acute. Inflorescence a lax open spike. Flowers open near sunset, one per stem per day; floral tube 1.2-3.5 cm, upcurved in bud. Sepals 5-15 mm, with free tips 0.3-3 mm, apical, spreading. Petals yellow to pale yellow, fading to orange, 5-22 mm. Anthers 2-6 mm; pollen ca. 50% fertile. Ovary strigillose, with spreading and sometimes a few glandular hairs; stigma surrounded by anthers. Capsules cylindric, 2-5 cm, sessile. Seeds in two rows per locule, brown to dark brown, ellipsoid to suborbicular, 0.9-1.8 mm, pitted. Fl. Apr-Sep(-Oct), fr. May-Oct. 2n = 14, permanent translocation heterozygote; self-compatible, autogamous.
Open, disturbed, usually sandy sites, often along coastal areas; near sea level to 400 m. Fujian, Taiwan [Japan; native to E North America, naturalized in S Africa, Australia, Central America, Europe, and South America].