Brunnera macrophylla (Adams). I.M. Johnston (syn.: Myosotis macrophylla Adams) (Caucasus) – A rare and often ephemeral alien, sometimes possibly persisting for some time or locally more or less naturalized. Probably first recorded in a road verge in Linkebeek in 1942, soon afterwards (in 1944) also in Sint-Genesius-Rode. Also seen in a wood margin (in residential area) near Brugge in 2001 (a single specimen). In the past decade seen on several occasions, especially in Flanders (see: http://waarnemingen.be/soort/view/9163 for an up-to-date overview).
This species is much reminiscent of Omphalodes verna and both might have been confused (although the latter is much rarer in Belgium, in cultivation as well as in the wild). In Brunnera macrophylla corollas are only 3-4 mm across, while they are ca. 10-15 mm across in Omphalodes verna.
Caddick H.M. & Holland S.C. (1989) Botanical notes and records. J. Gloucestershire Naturalists' Soc. 40: 12-13, 77-78, 130-132, 158-159.
Kent D.H. (1965) Brunnera macrophylla (Adam) I.M. Johnston. Bot. Soc. Brit. Isles Proc. 6: 50.
Sutorý K. (1991) Brunnera macrophylla coll., ein neuer Fund fur die Tschechoslowakei (in Czech). Časopis Morav. Mus. Brne 76(1-2): 283-284.