mendocina, P. alcaligenes, P. pseudoalcaligenes", and "P. balearica" are classified within the same branch of pseudomonads as "P. stutzeri" based on 16S rRNA sequences and other phylogenetic markers.Of this group, "P. stutzeri" is most closely related to "P. balearica" and they can be differentiated not only by the 16S rRNA sequences, but also by the ability of "P. stutzeri" to grow above 42 °C.