Eichhornia crassipes (C.F.P. Mart.) Solms-Laub.

Water hyacinth, common water hyacinth.
Eichhornia_crassipes_01_compr Eichhornia_crassipes_02_compr

Description 1

Free-floating, herbaceous, hydrophilous plant with many hanging stolons with fasciculated roots at the nodes, brownish black in colour. Can grow up to 1 m in height in favourable conditions. Leaves with bright green rosettes with spongy petioles at the base with a pattern of cells filled with air that allow it to float. Inflorescences on end spikes, sustained by a pendicle with spathe, the base of which is usually surrounded by a dilated leaf. Mauve or lilac coloured flowers. Fruit in a membranous capsule with three lobules and numerous seeds within.

Biology 1

It flowers from March to July. It reproduces actively both by seed and asexually (stolons, fragmentation). The seed can conserve their germinative capacity fro 5-20 years. Strong light and variations in temperature favour germination. Rapid colonization of new habitats upon being transported by water currents or by birds (seeds) or human activity.

Habitat 1

Ponds, wetlands, marshes, rivers, water reserves and lakes among others. Prefers areas with no current. Needs warm temperatures (optimum between 22-25oC), unable to withstand those below -2oC or above 40oC. Cannot withstand direct exposure to the sun. Resists certain levels of contamination. Can tolerate a pH level of between 5.5 and 9 and cannot tolerate high levels of salinity.

Sources 1

Spanish Catalogue of Exotic Invasive Species, Atlas of Exotic Invasive Plants in Spain, Project invasIBER

Spanish Catalogue of Exotic Invasive Species - Flora 1

http://www.magrama.gob.es/es/biodiversidad/temas/conservacion-de-especies/especies-exoticas-invasoras/ce_eei_flora.aspx

Fuentes y Créditos

  1. Adaptado por INVASORES - administrador de un trabajo de (c) cartotragsatec, algunos derechos reservados (CC BY), http://natusfera.gbif.es/guide_taxa/47

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