Ludwigia palustris

(Linnaeus) Elliott

Sketch Bot. S. Carolina 1: 211. 1817.

Common names: Marsh seedbox water purslane ludwigie palustre
Basionym: Isnardia palustris Linnaeus Sp. Pl. 1: 120. 1753
Synonyms: I. ascendens J. Hall I. nitida (Michaux) Poiret I. palustris var. americana de Candolle Ludwigia apetala Walter L. nitida Michaux L. palustris var. americana (de Candolle) Fernald & Griscom L. palustris var. inundata Svenson L. palustris var. liebmannii H. Léveillé L. palustris var. nana Fernald & Griscom L. palustris var. pacifica Fernald & Griscom
Treatment appears in FNA Volume 10.

Herbs often creeping, rooting at nodes, forming mats. Stems prostrate or decumbent and ascending at tips, subterete or with raised lines decurrent from leaf axils, well branched, 10–50(–70) cm, glabrous or, sometimes, minutely strigillose on leaf margins and inflorescence. Leaves opposite; stipules narrowly deltate, 0.05–0.1 × 0.05–0.1 mm; petiole narrowly winged, 0.1–2.5 cm, blade narrowly to broadly elliptic or ovate-elliptic, 0.5–4.5 × 0.3–2.3 cm, base abruptly attenuate, margins entire and minutely strigillose, apex subacute, surfaces glabrous; bracts not reduced. Inflorescences leafy spikes or racemes, flowers usually paired in leaf axils of prostrate stems; bracteoles attached at base or to 2.5 mm distal to base of ovary, sublinear, 0.3–1(–1.8) × 0.1–0.8 mm. Flowers: sepals ascending, green, ovate-deltate, 1.1–2 × 1–2.1 mm, margins finely serrulate with minute hairs, apex acuminate, sometimes with blunt tip, surfaces glabrous; petals 0; filaments translucent, 0.4–0.6 mm, anthers 0.2–0.4 × 0.3–0.6 mm; pollen shed singly; ovary oblong, 1.5–3.5 × 1–2 mm, glabrate; nectary disc elevated 0.15–0.3 mm on ovary apex, green, 1–2 mm diam., 4-lobed, glabrous; style pale green, 0.3–0.7 mm, glabrous, stigma subglobose or capitate, 0.4–0.6 × 0.2–0.4 mm, not exserted beyond anthers. Capsules oblong obovoid, 4-angled, (1.6–)2–5 × 1.5–3(–3.5) mm, thin-walled, irregularly dehiscent or dispersing as unit, pedicel 0–0.5 mm. Seeds yellowish brown, ellipsoid, 0.5–0.7 × 0.3–0.4 mm, surface cells transversely elongate. 2n = 16.

Phenology: Flowering Feb–Oct.
Habitat: Roadside ditches, wet meadows, dried pond bottoms, margins of ponds, swamps, rivers, alluvial sand bars.
Elevation: 0–1000[–2700] m.


B.C., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., Que., Ala., Ariz., Ark., Calif., Conn., Del., D.C., Fla., Ga., Idaho, Ill., Ind., Iowa, Kans., Ky., La., Maine, Md., Mass., Mich., Minn., Miss., Mo., Nebr., N.H., N.J., N.Mex., N.Y., N.C., Ohio, Okla., Oreg., Pa., R.I., S.C., Tenn., Tex., Vt., Va., Wash., W.Va., Wis., Mexico (Chiapas, Chihuahua, Guerrero, Hidalgo, Jalisco, México, Michoacán, Morelos, Nuevo León, Oaxaca, San Luis Potosí, Sinaloa, Sonora, Tamaulipas, Veracruz), West Indies (Cuba, Hispaniola, Jamaica, Puerto Rico), Bermuda, Central America (Costa Rica, Guatemala, Panama), South America (Colombia, Peru, Venezuela), Europe, sw Asia, Africa, intro­duced in Pacific Islands (Hawaii, New Zealand), Australia.


Ludwigia palustris is a common diploid and most widely distributed species in sect. Isnardia. It is particularly widespread in temperate North America and in Europe [the type is thought to be from Europe (P. H. Raven 1963[1964]; C. I. Peng et al. 2005)], more sporadically in Africa and sw Asia, and introduced in Australasia, and Hawaii. The close sister relationship of sect. Isnardia with sect. Miquelia (L. ovalis Miquel only, endemic to eastern Asia) suggests that this clade may have had a history connected with the evolution of the Arcto-Tertiary Geoflora (P. H. Raven and D. I. Axelrod 1974; Peng et al.).

Ludwigia palustris is known to hybridize with L. brevipes producing the sterile L. ×lacustris Eames.

Selected References


Lower Taxa

... more about "Ludwigia palustris"
Peter C. Hoch +
(Linnaeus) Elliott +
Isnardia palustris +
Marsh seedbox +, water purslane +  and ludwigie palustre +
B.C. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, Que. +, Ala. +, Ariz. +, Ark. +, Calif. +, Conn. +, Del. +, D.C. +, Fla. +, Ga. +, Idaho +, Ill. +, Ind. +, Iowa +, Kans. +, Ky. +, La. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Miss. +, Mo. +, Nebr. +, N.H. +, N.J. +, N.Mex. +, N.Y. +, N.C. +, Ohio +, Okla. +, Oreg. +, Pa. +, R.I. +, S.C. +, Tenn. +, Tex. +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Mexico (Chiapas +, Chihuahua +, Guerrero +, Hidalgo +, Jalisco +, México +, Michoacán +, Morelos +, Nuevo León +, Oaxaca +, San Luis Potosí +, Sinaloa +, Sonora +, Tamaulipas +, Veracruz) +, West Indies (Cuba +, Hispaniola +, Jamaica +, Puerto Rico) +, Bermuda +, Central America (Costa Rica +, Guatemala +, Panama) +, South America (Colombia +, Peru +, Venezuela) +, Europe +, sw Asia +, Africa +, introduced in Pacific Islands (Hawaii +, New Zealand) +  and Australia. +
0–1000[–2700] m. +
Roadside ditches, wet meadows, dried pond bottoms, margins of ponds, swamps, rivers, alluvial sand bars. +
Flowering Feb–Oct. +
Sketch Bot. S. Carolina +
I. ascendens +, I. nitida +, I. palustris var. americana +, Ludwigia apetala +, L. nitida +, L. palustris var. americana +, L. palustris var. inundata +, L. palustris var. liebmannii +, L. palustris var. nana +  and L. palustris var. pacifica +
Ludwigia palustris +
Ludwigia sect. Isnardia +
species +