Further arguments for the rejection of paraphyletic taxa:: Veronica subgen. Pseudolysimachium (Plantaginaceae)

The genus Veronica and its previous segregates have become one focus of the debate on whether to include paraphyletic taxa in classifications. The recent reclassification of Veronica to include the Southern Hemisphere Hebe-complex, North American Synthyris and Besseya, and the Eurasian Pseudolysimachion necessitated numerous nomenclatural changes including 24 new combinations in the latter presented here. The example of Pseudolysimachion demonstrates well the problems of paraphyletic taxa in classifications and therefore can serve as an exemplar.