Vegetation of the Czech Republic
Sambuco nigrae-Aceretum negundo Exner in Exner et Willner 2004
Sambuco-Aceretum negundo comprises scrub or short woodland dominated by the North American neophyte Acer negundo. Usually it forms an open canopy allowing coexistence of other shrub or tree species of various environmental affinities, ranging from species of dry habitats to those typical of floodplain forests. The herb layer includes species of ruderal and wet riparian habitats, including invasive neophytes. Acer negundo is a pioneer woody plant capable of rapidly spreading in disturbed areas. It occurs on mesic to wet, well insolated sites in warm areas, including urban and village habitats, spoil heaps and forest edges or abandoned grasslands in lowland river floodplains. In the Czech Republic Acer negundo-dominated vegetation is most common in the river floodplains of southern Moravia.
Orig. (Exner & Willner 2004): Sambuco nigrae-Aceretum negundo Exner ass. nov.
Diagnostic species: Acer negundo, Fraxinus angustifolia; Carduus crispus, Geum urbanum, Humulus lupulus, Parthenocissus inserta, Symphyotrichum novi-belgii agg., Torilis japonica
Constant species: Acer negundo; Galium aparine, Geum urbanum, Humulus lupulus, Symphytum officinale, Urtica dioica
Dominant species: Acer negundo
Formal definition: Acer negundo cover > 50 % NOT Sambucus nigra cover > 25 %
Source: Sádlo J. & Chytrý M. (2013): KBD03 Sambuco nigrae-Aceretum negundo Exner in Exner et Willner 2004. In: Chytrý M. (ed.), Vegetace České republiky. 4. Lesní a křovinná vegetace [Vegetation of the Czech Republic 4. Forest and shrub vegetation]. Academia, Praha, pp. 134-136.