View source for Ludwigia repens

{{Treatment/ID
|accepted_name=Ludwigia repens
|accepted_authority=J. R. Forster
|publications={{Treatment/Publication
|title=Fl. Amer. Sept.,
|place=6. 1771
|year=1771
|other_info_on_pub=(as Ludvigia), name conserved
}}
|common_names=Creeping primrose-willow;red ludwigia
|basionyms=
|synonyms={{Treatment/ID/Synonym
|name=Isnardia intermedia
|authority=Small & Alexander
|rank=species
}} {{Treatment/ID/Synonym
|name=I. natans
|authority=(Elliott) Kuntze
|rank=species
}} {{Treatment/ID/Synonym
|name=I. repens
|authority=de Candolle
|rank=species
}} {{Treatment/ID/Synonym
|name=I. repens var. rotundata
|authority=Grisebach
|rank=variety
}} {{Treatment/ID/Synonym
|name=Ludwigia fluitans
|authority=Scheele
|rank=species
}} {{Treatment/ID/Synonym
|name=L. natans
|authority=Elliott
|rank=species
}} {{Treatment/ID/Synonym
|name=L. natans var. rotundata
|authority=(Grisebach) Fernald & Griscom
|rank=variety
}} {{Treatment/ID/Synonym
|name=L. natans var. stipitata
|authority=Fernald & Griscom
|rank=variety
}} {{Treatment/ID/Synonym
|name=L. repens var. rotundata
|authority=(Grisebach) M. Gómez
|rank=variety
}} {{Treatment/ID/Synonym
|name=L. repens var. stipitata
|authority=(Fernald & Griscom) Munz
|rank=variety
}}
|hierarchy=Onagraceae;Onagraceae subfam. Ludwigioideae;Ludwigia;Ludwigia sect. Isnardia;Ludwigia repens
|hierarchy_nav=<div class="higher-taxa"><div class="higher-taxon"><small>family</small>[[Onagraceae]]</div><div class="higher-taxon"><small>subfamily</small>[[Onagraceae subfam. Ludwigioideae]]</div><div class="higher-taxon"><small>genus</small>[[Ludwigia]]</div><div class="higher-taxon"><small>section</small>[[Ludwigia sect. Isnardia]]</div><div class="higher-taxon"><small>species</small>[[Ludwigia repens]]</div></div>
|volume=Volume 10
|mention_page=
|treatment_page=
}}<!--

--><span class="statement" id="st-undefined" data-properties=""><b>Herbs </b>creeping and rooting at nodes, often forming loose mats. <b>Stems</b> prostrate, ascending to suberect at tips, terete, sparsely branched, 30–80 cm, glabrous or, sometimes, minutely strigillose on leaf margins and inflorescence. <b>Leaves</b> opposite; stipules narrowly deltate, 0.05–0.1 × 0.05–0.1 mm; petiole narrowly winged, 0.3–2.3 cm, blade narrowly elliptic to broadly lanceolate-elliptic or suborbiculate, 0.8–4.5 × 0.4–2.7 cm, base attenuate, margins entire or sometimes with hydathodal glands, apex acute or apiculate, rarely obtuse, surfaces lustrous, subglabrous or sparingly to densely papillose strigillose; bracts not much reduced. <b>Inflorescences</b> sometimes few-flowered, erect racemes, flowers paired in leaf axils of prostrate stems; bracteoles attached in opposite pairs to pedicel 1–5 mm proximal to base of ovary, lanceolate to narrowly oblong-lanceolate or sublinear, 1–5(–8) × 0.2–1 mm, apex acute, surfaces sparingly minutely strigillose. <b>Flowers</b>: sepals ascending, light green, ovate deltate to narrowly so, 1.8–5 × 1.5–3.5 mm, margins minutely strigillose, apex acuminate to elongate-acuminate, surfaces subglabrous; petals caducous, oblanceolate to elliptic-oblong, 1.1–3 × 0.4–1.4 mm, base attenuate, apex obtuse, often variable in size and shape in same flower; filaments pale yellow, 0.5–1.5 mm, slightly inflated near base, anthers 0.4–0.9 × 0.3–0.8 mm; pollen shed singly or in tetrads; ovary obconic-cylindric, barely 4-angled to subterete, 2–6 × 2.5–3.5 mm; nectary disc elevated 0.3–0.8 mm on ovary apex, yellow, 1.1–3 mm diam., 4-lobed, glabrous; style pale yellow, 0.6–0.9 mm, glabrous, stigma pale yellow, broadly capitate, 0.3–0.5 × 0.3–0.8 mm, usually not exserted beyond anthers. <b>Capsules</b> elongate-obpyramidal, 4-angled, corners sometimes rounded, 4–10 × 2.5–4 mm, hard-walled, irregularly dehiscent, pedicel 0.1–3 mm. <b>Seeds</b> yellowish brown, ellipsoid, 0.6–0.8 × 0.3–0.5 mm, surface cells transversely elongate. <b>2n</b> = 48.</span><!--

-->{{Treatment/Body
|discussion=<p>Flowers Mar–Nov (year-round). Muddy or damp, sandy edges of pools, lakes, swamps, creeks, and roadside ditches, moist soil in solution pits in limerock and hammock clearings in Florida Everglades, shade or sun; 0–1200[–1600] m; Ala., Ariz., Calif., Fla., Ga., Kans., La., Miss., Nev., N.J., N.Mex., N.C., Okla., Oreg., S.C., Tenn., Tex., Va.; Mexico (Chihuahua, Coahuila, México, Morelos, Nuevo León, Puebla, San Luis Potosí, Sonora); West Indies (Bahamas, Cuba, Hispaniola, Jamaica); Bermuda; introduced in Asia (Bangladesh, Japan).</p><!--
--><p>Ludwigia repens occurs primarily on the Atlantic and Gulf coastal plains of the United States from North Carolina to Texas, with more scattered distribution into west Texas, New Mexico, Oklahoma, and Kansas, and disjunct populations in New Jersey, Tennessee, southern Arizona, Nevada, California, and western Oregon (Marion County); it also occurs in northern and central Mexico and the Caribbean region. In some parts of this wide range it is considered an aquatic weed.</p><!--
--><p>Ludwigia repens is one of the most popular species of Ludwigia used in the aquarium trade; this may help to account for its wide distribution.</p><!--
--><p>Much like the related diploid Ludwigia palustris, the hexaploid L. repens is widespread and morphologically variable, and infraspecific taxa have been proposed to describe this variation. Given the tendency of species in sect. Isnardia to hybridize, and the lack of a geographical basis for much of the variation, C. I. Peng (1989) declined to adopt any infraspecific classification, and this treatment follows Peng.</p><!--
--><p>As described in C. I. Peng et al. (2005), Ludwigia repens J. R. Forster was conserved with a new type (the original type selected was from Virginia, where the species does not occur); L. repens Swartz (1797) was a later homonym described from Jamaica and pertains here.</p>
|tables=
|references=
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-->{{#Taxon:
name=Ludwigia repens
|authority=J. R. Forster
|rank=species
|parent rank=section
|synonyms=Isnardia intermedia;I. natans;I. repens;I. repens var. rotundata;Ludwigia fluitans;L. natans;L. natans var. rotundata;L. natans var. stipitata;L. repens var. rotundata;L. repens var. stipitata
|basionyms=
|family=Onagraceae
|reference=None
|publication title=Fl. Amer. Sept.,
|publication year=1771
|special status=
|source xml=https://xjsachs2@bitbucket.org/aafc-mbb/fna-data-curation.git/src/1f4bf54ae2f7dbd5376c45b4fe1b388e15b53086/coarse_grained_fna_xml/V10/V10_260.xml
|subfamily=Onagraceae subfam. Ludwigioideae
|genus=Ludwigia
|section=Ludwigia sect. Isnardia
|species=Ludwigia repens
}}<!--

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