Pine trees evolved in the early Mesozoic c. 250 Mya and the pine genus originated in Laurasia in the Early Cretaceous c. 130 Mya in competition with faster growing flowering plants. Pines adapted to cold and arid climates in environments were the growing season was shorter or wildfire common; this evolution limited pine range to between 31° and 50° north and resulted in a split into two subgenera: "Strobus" adapted to stressful environments and "Pinus" to fire-prone landscapes. By the end of the Cretaceous pines were established across Laurasia, from North America to East Asia.