Résumé
From various flora and vegetation studies of the Aures Massif (northeast of Algeria), the orchids have been the subject of a specific inventory coupled with a phytoecological survey. After fourteen years, only nine species in fifteen localities have been recorded, including following taxa: Cephalanthera longifolia, Epipactis helleborine, Himanthoglossum hircinum subsp. hircinum, Ophrys luteasubsp. lutea, Ophrys scolopax subsp. apiformis, Ophrys subfusca subsp. subfusca, Ophrys tenthredinifera subsp. ficalhoana, Orchis olbiensis, Orchis purpurea subsp. purpurea. In addition to those ones, other species are reported in the literature in this massif or in the nearby massif of Belezma. These observations allowed us to confirm the taxonomy of some taxa which are still confused in the recent literature. The multidimensional analyses have revealed the station typology and some environmental variables that determine the distribution of these species in this region. Due to the alarming vulnerability of these sites and the threats, especially anthropogenic, to which they are subjected, a reflection to protect the habitats and their hosts seems to be urgent.