1e. Carpinus betulus ‘ Pendula ’ C. [unranked] pendula Massé, Revue Horticole ser. 4 2: 271 (Massé 1853). – C. betulu s var. pendula (Massé) G.Kirchn., Arboretum Muscaviense: 667 (Petzold & Kirchner 1864). – C. pendula (Massé) K.Koch, Dendrologie 2 (2): 3 (Koch 1873). – C. betulus f. pendula (Massé) Schelle, Handbuch der Laubholzbenennung: 48 (Beissner et al. 1903). – Original citation: No detailed data given. – Type: not localized. – Note: this is a cultivar with weak, overhanging branches. Massé mentions a “ Carpinus pendula ” but immediately called it a variety of the common hornbeam. Therefore, the taxonomic status is unclear upon publication, and the name is to be treated as unranked. Although neither Koch nor Beissner et al. (1903) explicitly refer to Massé, the names are to be regarded as a new combination (Art. 41.4; McNeill et al. 2012).

Published as part of Holstein, Norbert & Weigend, Maximilian, 2017, No taxon left behind? - a critical taxonomic checklist of Carpinus and Ostrya (Coryloideae, Betulaceae), pp. 1-52 in European Journal of Taxonomy 375 on page 8, DOI: 10.5852/ejt.2017.375, http://zenodo.org/record/3838542