Aster amellus L. (C-Eur., SW- and C-As.) – An exceptional and ephemeral escape from cultivation. Recorded once – without further details – in Woluwe (Brussel).
Aster amellus is native close to the Belgian frontiers in northeastern France and Luxembourg. It is sometimes cultivated as an ornamental.
A related taxon of hybrid origin, Aster xfrikartii Silva Tarouca & C. Schneider (= A. amellus x A. thomsonii C.B. Clarke), is now probably more frequently cultivated and may occur as an escape from cultivation
Selected literature:
Kovanda M. (2002) A note on Aster amellus. Thaiszia 12(1): 83-87. [available online at: http://www.upjs.sk/public/media/5745/thaiszia-12-083-087-2002-kovanda.pdf]
Mandáková T. & Münzbergová Z. (2008): Morphometric and genetic differentiation of diploid and hexaploid populations of Aster amellus agg. in a contact zone. Plant Systematics and Evolution 274: 155-170. [available online at: http://www.academia.edu/7811246/Mand%C3%A1kov%C3%A1_and_M%C3%BCnzbergov%C3%A1_Z._2008_Morphometric_and_genetic_differentiation_of_diploid_and_hexaploid_populations_of_Aster_amellus_agg._in_a_contact_zone._-_Plant_Systematics_and_Evolution_274_155-170]
Raabová J., Fischer M. & Münzbergová Z. (2008) Niche diVerentiation between diploid and hexaploid Aster amellus. Oecologia 158: 463-472. [available online at: http://www.botany.unibe.ch/planteco/abstr_repr/Oecologia_158_463.pdf]