Pacific Island Ecosystems at Risk (PIER)

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Ludwigia sedoides
(Humboldt & Bonpland) H. Hara, Onagraceae
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Present on Pacific Islands?  yes

Primarily a threat at high elevations?  no

Common name(s): [more details]

Spanish: canario de agua

Habit:  aquatic herb

Description:  "Aquatic perennial herbs. Stem very slender, 0.2-0.5 cm thick, freely branching below, rooting along nodes, terete, glabrous, bearing floating rosettes of densely packed leaves at the ends. Leaves: Stipules 3-4 mm long, 1-2 mm wide, deltoid, deciduous with age. Petioles 5-100 mm long, usually flattened, often reddish, glabrous or strigillose. Leaf blade 0.5-2 cm long and wide, rhombicovate, thick, acute at base, crenate-serrate in upper half, entire in lower half, strigillose or sometimes glabrous, usually bright pinkish beneath and along margins and bright green above, minutely glandular-punctate above; venation faint, with 4-6 veins on each side of the midrib; submarginal veins absent. Flowers: Flowers solitary, emerging out of the water, pedicels 10-30 mm long, often reddish, bracteoles 4-6 mm long, ca. 1 mm wide, setaceous, not subtended by stipels, sepals 0.6-1 cm long, 0.2-0.6 cm wide, oblong-ovate, obtuse or acute at tip, 3-5-nerved, thick, petals 1-1.5 cm long, 0.8-1.3 cm wide, broadly obovate, emarginate, subsessile, yellow, stamens subequal, 2.8-3.2 mm long, or sometimes unequal in larger-flowered individuals, when unequal, the filaments of the episepalous anthers ca. 4 mm long, those of the epipetalous ones 3-3.5 mm long, filaments dilated toward the base, anthers ca. 2 mm long, rounded, ovary 10-15 mm long, 2-4.5 mm thick, obconic, 4-angled, glabrous, disk plane, hairy, style 2.5-4 mm long, 0.2-0.3 mm thick, white, stigma 0.7-1 mm long, 1-2 mm thick, depressed-globose, sometimes 4-lobed. Fruit: Capsule 8-14 mm long, 2-4 mm thick, obconic, gradually narrowed towards the base, 4-angled, sometimes rounded, glabrous. Seeds: Seeds 0.55-0.6 mm long, 0.2-0.25 mm thick, obovoid-oblong, slightly curved, brown, striate; raphe reduced and inconspicuous. Probably autogamous"  (Smithsonian Botany online).

Habitat/ecology:  In its native habitat, "forms beautiful colonies of plants with symmetrically arranged leaves floating on the surface of lakes and ponds and occasionally in seasonally dry marshes"  (Smithsonian Botany online).

Propagation:  "Propagation is usually by stem division or by breaking off lateral shoots, which quickly develop into new plants" (Staples & Herbst, 2005; p. 446).

Native range:  Mexico, Central and South America (GRIN).

Presence:

Pacific
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
State of Hawaii
Hawaiian Islands
O‘ahu Island   Bishop Museum (U.S.A. Hawaii. Honolulu.) (year unknown) (voucher ID: BISH 652360)
Taxon name on voucher: Ludwigia sedoides
Pacific Rim
Country/Terr./St. &
Island group
Location Cited status &
Cited as invasive &
Cited as cultivated &
Cited as aboriginal introduction?
Reference &
Comments
Colombia
Colombia
Colombia (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Costa Rica
Costa Rica
Costa Rica (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Ecuador (Mainland)
Ecuador
Ecuador (Republic of) (continental) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
El Salvador
El Salvador
El Salvador (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Guatemala
Guatemala
Guatemala (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Honduras
Honduras
Honduras (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Mexico
Mexico
Mexico (United Mexican States) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Campeche, Yucatan
Nicaragua
Nicaragua
Nicaragua (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Panama
Panama
Panama (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Perú
Perú
Perú (Republic of) native
U.S. Dept. Agr., Agr. Res. Serv. (2013)
Singapore
Singapore
Singapore (Republic of) introduced
cultivated
Chong, Kwek Yan/Tan, Hugh T. W./Corlett, Richard T. (2009) (p. 57)


Need more info? Have questions? Comments? Information to contribute? Contact PIER! (pier@hear.org)

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This page was created on 21 JUL 2013 and was last updated on 8 AUG 2013.