Contribution au prodrome des végétations de France : les Quercetea robori-petraeae Braun-Blanq. & Tüxen ex Braun-Blanq., Roussine & Nègre 1952

The declination of the Quercetea robori-petraeae Braun-Blanq. & Tüxen ex Braun-Blanq., Roussine & Nègre 1952 class is proposed for the new French vegetation prodrome (PVF2). It contains 23 associations, 4 sub-alliances, 8 alliances and 3 orders. This class comes from the spliting of the Querco roboris-Fagetea sylvaticae Braun-Blanq. & Vlieger in Vlieger 1937 “ superclass », which appeared in the first French vegetation prodrome (PVF1, BARDAT et al., 2004). Besides the creation of a separate class, there are very few changes from the first French vegetation prodrome (PVF1, Bardat et al., 2004). This new class corresponds to the PVF1 Quercetalia roboris Tüxen 1931, except that we recognise the order of the Molinio caeruleae- Quercetalia roboris H. Passarge 1968 for the alliance Molinio caeruleae-Quercion roboris Scamoni et H. Passarge 1959 (this alliance was in the Quercetalia roboris in the PVF1). The Quercetalia roboris is increased by two new alliances, a continental one (Agrostio capillaris- Quercion petraeae Scamoni & H.Passarge 1959) and a very oceanic one, the Hymenopyllo tunbrigensis-Quercion roboris Je. Pall. 2000. The PVF1 Hyperico montani-Quercenion robori- petraeae Rameau 1996 nom. inval. is validated here, but as an alliance (Hyperico montani- Quercion petraeae Rameau ex all. nov.). Finally, the Lonicero periclymeni-Betuletalia pubescentis Willner & Mucina in Willner et al. 2016 is added, even if we lack data to propose any association. Key-words Querco roboris-Fagetea sylvaticae Braun-Blanq. & Vlieger in Vlieger 1937, Quercetalia roboris Tüxen 1931, Molinio caeruleae-Quercetalia roboris H. Passarge 1968, beech-oak forest, oak forest, acidophilous deciduous forests.