New records of chromosome numbers are presented for eleven Australian species of Veronica sens. lat. Reference is also given to records previously published for ten species that have been referred to Derwentia, Parahebe or Chionohebe, but that are now included in a widely circumscribed Veronica. The species formerly included in Derwentia, Parahebe or Chionohebe exhibit secondary base numbers of x = 21, 20 or 19, whereas those formerly retained in Veronica have x = 18 (or 17). For the species formerly referred to Detzneria, from New Guinea, we present only a very approximate count of 2n = 38-42 which, however, differs from the previous report of 2n = 48.

Four Australian species of Veronica sens. lat. are newly described and illustrated; lectotypes are selected for other species and synonyms. In