Ludwigia octovalvis (Jacq.) Raven

Fujian, Guangdong, Guangxi, Guizhou, Hainan, Jiangxi, Sichuan, Taiwan, E Xizang, Yunnan, Zhejiang [India, Japan, Malaysia, Myanmar, Singapore, Thailand, Vietnam; widespread throughout Africa, S, SE, and SW Asia, Australia, Europe, North America, Pacific islands, South America].

Chile Central

Herbs robust, erect, perennial, sometimes woody at base or even shrubby. Stems 25-400 cm tall, well-branched, densely spreading pubescent at least on upper stem, or puberulous or subglabrous. Petiole 1-10 mm; leaf blade linear to subovate, 1-14 × 0.3-4 cm, lateral veins 11-20 per side, submarginal vein prominent, base narrowly or broadly cuneate, apex attenuate. Sepals 4, ovate or lanceolate, 6-15 mm. Petals yellow, broadly obovate, 6-17 × 5-17 mm. Stamens 8; filaments 1-4 mm; anthers 1.2-4 mm; pollen in tetrads. Style 1.5-3.5 mm; stigma subglobose, shallowly 4-lobed. Capsule pale brown with 8 darker ribs, cylindric, terete, 1.7-4.5 cm, 2-8 mm in diam., thinly walled, readily and irregularly loculicidal; pedicel 1-10 mm. Seeds in 2 or more rows per locule, free, brown, 0.6-0.75 mm, raphe inflated and equal in size to seed body, evenly transversely ridged. Fl. and fr. Jan-Dec. 2n = 32, 48*.

"Erect herbs, to 1.5 m high, stem densely villous. Leaves to 7 x 1.5 cm, lanceolate, densely hairy; nerves many, oblique; petiole 5 mm long. Flowers axillary, sessile; calyx lobes 4, 9 x 5 mm, ovate, acuminate, hispid; petals 10 x 7 mm, obovate, glabrous; anthers oblong; ovary hispid; disk 8-lobed, lobes clavate. Capsule 4.5 x 0.4 cm, linear, terete, hispid; seeds 0.6 x 0.6 mm, obliquely orbicular, muriculate, one side transversely rugose."