Nicotiana langsdorffii J.A. Weinm. (S Am.) – A very rare and ephemeral alien. Collected on scattered occasions in Belgium in the 19th century, the first time apparently in 1859 (Verloove 2006). In 2016 it was rediscovered in Veurne and in 2017 in Brugge. All records probably refer to garden escapes although N. langsdorffii apparently is not widely cultivated in western Europe (e.g. www.plantago.nl).
This species and N. rustica show some resemblance (especially on account of their greenish yellow corolla with nearly entire limb) and both were formerly accommodated in the same section (Don 1838). However, N. langsdorffii is only remotely related and is closest in fact to N. alata (Knapp & al. 2004). It is distinguished from N. rustica by its sessile leaves that are narrowed and decurrent at the base (vs. clearly petiolate), its corollas are funnel-shaped with a gibbous ring above and a concave limb (vs. tubular with a much shorter tube); moreover, its corollas are pendulous not erect.
Nicotiana langsdorffii is a fairly rare alien in Europe. Clement & Foster (1994) provide a single record from the British Isles. It was recently also documented from Sweden (Karlsson 2002).
The specific epithet is frequently misspelt as “langsdorfii” (e.g. Clement & Foster 1994, Verloove 2006).
Clement E.J. & Foster M.C. (1994) Alien plants of the British Isles. BSBI, London: XVIII + 590 p.
Don. G. (1838) Nicotiana. In: A General History of the Dichlamydeous Plants, vol. 4. J. G. E. F. Rivington, London: 462-467.
Karlsson T. (2002) Nyheter i den svenska kärlväxtfloraen III. Fjällgröneväxter – korgblommiga. Svensk Bot. Tidskr. 96(5): 234-255. [available online at: http://svenskbotanik.se/wp-content/uploads/2013/10/Karlsson6.pdf]
Knapp S., Chase M.W. & Clarkson J.J. (2004). Nomenclature changes and a new sectional classification in Nicotiana (Solanaceae). Taxon 53: 73-82. [available online at: https://www.researchgate.net/publication/233688146_Nomenclatural_Changes...
Verloove F. (2006) Catalogue of neophytes in Belgium (1800-2005). Scripta Botanica Belgica 39: 89 p. [available online at: http://alienplantsbelgium.be/sites/alienplantsbelgium.be/files/tabel_2.pdf]