Flora of North America species comparison

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Ludwigia peploides subsp. montevidensis
Photo is of parent taxon

floating primrose-willow, floating water primrose
Stems

usually densely villous, rarely sparsely so, hairs often viscid when fresh, or glabrate on submerged stems.
Leaves

alternate, sometimes fascicled;

stipules often asymmetrical;

petioles of basal leaves (0.5–)0.8–1.6 cm, those of distal leaves 0.5–2.8 cm;

blade (0.4–)1–6(–9.5) cm, apex glandular-mucronate, surfaces not shiny, usually densely hirtellous, rarely glabrous abaxially.
Flowers

anthers on short filaments (0.7–)0.9–1.8 mm, those on long filaments (0.8–)1.1–2.2 mm;

ovary 6–10 mm, apex truncate, densely hirtellous, sometimes only on apical 1/2, stigma usually as long as anthers, rarely exserted beyond them.
Capsules

(20–)24–32 × 2–4 mm, pedicel 7–38(–60) mm.
Seeds

10–15 per locule.
2n

= 16 (32).

Ludwigia peploides subsp. montevidensis
Phenology Flowering summer-early fall.
Habitat Wet places, along slow-moving rivers, streams, canals, ditches, often growing into main channels as aquatic weeds.
Elevation 0–500[–2000] m. (0–1600[–6600] ft.)
Distribution
from FNA
CA; LA; South America (Argentina, Brazil, Chile, Peru, Uruguay) [Introduced in North America; introduced also in Europe (France), Pacific Islands (New Zealand), Australia]
[BONAP county map]
Discussion

In the flora area, subsp. montevidensis is introduced in California (P. H. Raven 1963c), where it was first collected in 1906 (El Dorado County, Rixford s.n., CAS), and in Louisiana. Subspecies montevidensis occasionally forms masses of vegetation that can obstruct water flow and navigation in California and elsewhere.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 10.
Parent taxa Onagraceae > subfam. Ludwigioideae > Ludwigia > sect. Jussiaea > Ludwigia peploides
Sibling taxa
L. peploides subsp. glabrescens, L. peploides subsp. peploides
Synonyms Jussiaea montevidensis, J. repens var. montevidensis, L. adscendens var. montevidensis, L. peploides var. montevidensis
Name authority (Sprengel) P. H. Raven: Reinwardtia 6: 395. (1964)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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