This alliance includes mesic groves of the North American neophyte Robinia pseudoacacia, which can reach a height of 25 m. Robinia is often the only species in the tree layer, but the shrub layer is usually well developed and can be rich in species. The herb layer is characterized by mesophilous nutrient-demanding ruderal species. In many places distinct synusiae of vernal geophytes and therophytes occur. This alliance is distributed across warm areas of central Europe. In the Czech Republic it occurs at altitudes below 480 m.