1. Pertaining to brackish water having a salinity between ten and seventeen parts per thousand, or to sea water having a salinity greater than thirty-four parts per thousand: Polyhaline water is the second highest saline region of a salt-marsh, in agreement with the Venice system for classifying brackish water.
2. Concerning extremely salt-tolerant species: One polyhaline taxonomic group is the common sea lavender of the genus Limonium, which has spikes of white or mauve flowers.