Mahonia aquifolium is by far the most common Mahonia in Southern German parks and gardens, and comes from North America. The berries are spread by birds and the plant easily naturalizes, especially in areas with sandy soil such as the Upper Rhine Valley. The typically glossy leaves of Mahonia aquifolium consist of 5 - 9 leaflets, the ratio of length and width of the terminal leaflet is greater than in other species: 1.7 to 2.5 (young plants initially have fewer and shorter leaflets). The absolute size of the leaves is immaterial and depends, for example, on the light conditions at the site. The edges of the leaflets are very wavy, the barbed teeth mostly protruding. In winter, the leaves of Mahonia aquifolium can be tinged with dark red. The whole plant becomes typically 1 meter tall, but can reach 2 meters in rare cases.
In Franconia, hybrids of Mahonia aquifolium with the taller, more multi-leaved Mahonia pinnata were found. The horticulturally produced hybrid is called Mahonia x wagneri. In Viernheim in southern Hesse, there are also variations which at least tend towards this hybrid.
In Franconia, also hybrids of Mahonia aquifolium with the smaller, less-leaved and stoloniferous Creeping Oregon Grape Mahonia repens were found. The hybrid is called Mahonia x decumbens. In the Perchtoldsdorf Heath in the Vienna Woods there are such plants, too, but these are being fought as invasive neophytes, so I only found young shoots.