Anchusa ochroleuca Bieb. (SE and E Eur.) – A rare and ephemeral, much decreasing alien. Apparently first recorded in 1889 and 1890 on an off-ramp in Huy, subsequently in coastal dunes in Nieuwpoort in 1890 and in 1893 also in a clover field near Liège. Exceptionally seen as a wool alien in the Vesdre valley (for instance in 1907) and on dumps near Antwerpen in 1939 and 1940. The most recent record is from a railway bank in Jamioulx in 1953 (as Anchusa officinalis).
Plants of Anchusa officinalis with cream corollas have been recorded several times in Belgium. They differ from Anchusa ochroleuca in having calyx lobes that are acute and without a distinct hyaline margin. Where both species occur hybrids are rather easily produced (see van Ooststroom & Reichgelt 1961).
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Selected literature:
De Langhe J.E. (1943) Quelques notes floristiques. Bull. Soc. Roy. Bot. Belg. 75: 137-140.
Lawalrée A. (1950) Notice sur des phanérogames adventices en Belgique. Bull. Soc. Roy. Bot. Belg. 83: 43-49.
Van Ooststroom S.J. & Reichgelt Th.J. (1961) Boraginaceae. In: van Ooststroom S.J. & al. (eds.), Flora Neerlandica, vol. 4(1). KNBV, Amsterdam: 92-140.