African Plant Database

Eichhornia natans (P. Beauv.) Solms
Information on the genus : Eichhornia
Basionym : Pontederia natans P. Beauv.
Status for SA : rejected (present), is synonym of : Eichhornia diversifolia (Vahl) Urb.
Status for TA : rejected (present), is synonym of : Eichhornia diversifolia (Vahl) Urb.
Synonym(s) Homotypic
 Pontederia natans P. Beauv.
Synonym(s) Heterotypic
=Leptosomus natans (P. Beauv.) Schltdl.
=Eichhornia diversifolia (Vahl) Urb.
Ecology and distribution
Trop. Afr.
Biology : Aquatic herb rooted, sometimes forming dense submerged mats in freshwater 1-2 m deep; submerged stems branched, to 2 m long, 1,5-3 mm Ø, rooting at lower nodes; roots long, with numerous rootlets; juvenile leaves submerged, borne along stems, linear, 3-8x0,1-0,4 cm; adult leaves alternate, dimorphic; submerged ones linear, 30-70x0,2-0,4 cm, sessile; floating ones on upper part of stem with petiole 2,5-8,5 cm long; blade ovate to orbicular, 0,8-2,5x0,6-2,2 cm, cordate at base, apex obtuse to subacute, margins undulate; inflorescence reduced to a solitary flower which appears to rise from the petiole; perianth tubular below, 6-lobed, tube to 2 cm long, lobes ± equal, narrowly ovate, 5-6 mm long, blue, lacking a yellow spot; open flower c. 7 mm Ø; capsule spindle-shaped, 1-2 cm long, 1,5-3 mm Ø, style persistent.
Ecology : In shallow still or slow-flowing water, river, lakes formed by dams and small ponds, lagoons; swamps; swampy savanna; rice-fields; usually in full sun; member of the Eichhornieto-Ranalismetum J. Léonard association in the Yangambi area (Zaire), with Ranalisma humile; member of the Eichhornia natantis-Nymphaeetum micranthae association dominated by guinéo-congolesian species, described from Niger (Etudes flore, végétation Burkina Faso 9: 34, 2005); 0-1700 m alt.
  Very similar to the tropical American E. diversifolia (Vahl) Urb. which has, however, 2-3-flowered inflorescences, flowers violet-blue with a yellow blotch, perianth 3 cm long and 2 cm Ø.
  A potential nuisance in waterways (in particular in Gambia) and rice fields.
South. Afr.
Biol./Eco : perennial-Herb, Hydrophyte, Epihydate- Ht 0.2 - 1 m. Alt: 1030 m. Distribution: BOT, NAM
  • Cat. Pl. Vasc. Burkina Faso:120 (2012)
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    see under Jstor_African Plant Initiative
    see under The Euro-Mediterranean Plant Base
    see under Flore d'Afrique Centrale
    see under African Plants - a Photo Guide
    see under Missouri Botanical Garden
    see under Flora of Zimbabwe
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    Record n°23657
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