The class Elyno-Seslerietea comprises species-rich grasslands on limestone, dolomite or other base-rich rocks, which occur in the alpine and subalpine belt of temperate European mountain ranges. These grasslands are usually dominated by graminoids such as Calamagrostis varia, Carex ferruginea, C. firma, C. sempervirens, Festuca versicolor and Sesleria caerulea. Since there is almost no limestone above the timberline in Czech mountains, vegetation of this class is very rare, occurring only on restricted outcrops of base-rich rocks embedded in the predominating siliceous rocks.