Ludwigia peploides subsp. peploides
Onagraceae subfam. ludwigioideae
floating primrose-willow, floating water primrose, Matted water primrose
glabrous or sparsely villous.
alternate or fascicled;
stipules symmetrical;
petioles of basal leaves 0.3–0.8 cm, those of distal leaves 0.2–2.5 cm;
blade 0.8–4(–8.5) cm, apex sometimes glandular-mucronate, surfaces shiny, glabrous, rarely ciliate or minutely pellucid-punctate.
stipules present.
anthers on short filaments 0.5–1.1 mm, those on long filaments 0.8–1.2 mm;
ovary 6–14 mm, apex truncate, glabrous or with scattered hairs, stigma usually as long as anthers, rarely exserted beyond them.
floral tube absent;
sepals (3 or)4 or 5(–7), persistent at ovary apex after dehiscence of other floral parts;
petals yellow or white, rarely absent.
10–17(–25) × 2–3 mm, pedicel 10–35 mm.
7–14 per locule.
= 16.
Ludwigia peploides subsp. peploides
Onagraceae subfam. ludwigioideae
Genus 1, species 82 (31 in the flora): North America, Mexico, West Indies, Bermuda, Central America, South America, se Asia, Africa, Indian Ocean Islands, Pacific Islands, Australasia; introduced in Europe, w Asia.
Ludwigioideae were segregated as a distinct subfamily (W. L. Wagner et al. 2007) to reflect the phylogenetic relationship of Ludwigia as sister to other genera of Onagraceae in morphological and molecular analyses (see R. A. Levin et al. 2003, 2004). Ludwigia is distinguished by the absence of a floral tube, persistence of sepals on capsules after other floral parts dehisce, pollen shed in tetrads or polyads (or as monads in some sections, tetrads sometimes found elsewhere in Onagraceae), double ovule vascular supply, uniquely including a central supply (R. H. Eyde 1981), single-celled ovule archesporium (H. Tobe and P. H. Raven 1996), and a base chromosome number of x = 8.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
CA
OR
Flora NW
PNW Herbaria
WildflowerSearch
iNaturalist
USDA Plants Database
