C. betulus C. betulus var. purpurea (K.Koch) G.Nicholson, The Garden No taxon left behind? - a critical taxonomic checklist of Carpinus and Ostrya (Coryloideae, Betulaceae) Holstein, Norbert Weigend, Maximilian European Journal of Taxonomy 2017 2017-12-07 375 1 52 RG23 ' Purpurea Purpurea [637,982,1589,1616] Magnoliopsida Betulaceae Carpinus GBIF Plantae Fagales 7 8 Tracheophyta species betulus    C. betulusf. purpureaK.Koch, Dendrologie2 (2): 3 ( Koch 1873). –  C. betulusvar. purpurea(K.Koch) G.Nicholson, The Garden( London 1871–1927) 24: 419 ( Nicholson 1883). – Original citation: No detailed data given. – Type: not localized. – Note: this is a cultivar with initially brownish-red leaves that turn greenish soon after. Nicholson does not refer to Koch, but intended to describe the same cultivar, therefore Art. 41.4 ( McNeill et al.2012) applies.