Eichhornia Kunth
Eichhornia is a small genus of seven species. All are native in tropical America and Africa. In its current circumscription it is paraphyletic, Pontederia L. and Monochoria C. Presl being embedded in it (Graham et al. 1998; see also Ness et al. 2011).
A single species, Eichhornia crassipes, is cultivated as an aquatic ornamental in Belgium. It has been recorded as an escape.
Literature:
Barrett S.C.H. (1988) Evolution of breeding systems in Eichhornia (Pontederiaceae): a review. Ann. Missouri Bot. Gard. 75(3): 741-760.
Galan de Mera A. (1994) Sobre Eichhornia Kunth (Pontederiaceae) en el Peru. An. Jard. Bot. Madrid 52(1): 122-123.
Graham S.W., Kohn J.R., Morton B.R., Eckenwalder J.E. & Barrett S.C.H. (1998) Phylogenetic congruence and discordance among one morphological and three molecular data sets from Pontederiaceae. Syst. Biol. 47: 545-567.
Horn C.N. (1991) No.498: Taxonomic problems in the genera Eichhornia and Pontederia (Pontederiaceae). Amer. J. Bot. 78 (Suppl.) 6: 192-193.
Nelson E.C. (1986c) Pontederiaceae. In: Walters S.M. & al. (eds.), The European Garden Flora, vol. 1. Cambridge University Press, Cambridge: 331-332.
Ness R.W., Graham S.W. & Barrett S.C.H. (2011) Reconciling Gene and Genome Duplication Events: Using Multiple Nuclear Gene Families to Infer the Phylogeny of the Aquatic Plant Family Pontederiaceae. Mol. Biol. Evol. 28(11): 3009-3018. [available online at: http://mbe.oxfordjournals.org/content/28/11/3009.full.pdf+html]