An antiquated, inaccurate, and now debunked etymological theory held that the city's name originated from the word ''may-nilad'' (meaning "where ''nilad'' is found"). There are two versions of this false etymology. One popular incorrect notion is that the old word ''nilad'' refers to the water hyacinth (''Eichhornia crassipes'') that grows on the banks of the Pasig River. However, this plant species was only recently introduced into the Philippines from South America, and therefore could not have been the source of the toponym for old Manila.