Among the plants, conspicuous introductions are osage-orange (Maclura pomifera), honey locust (Gleditsia triacanthos) and ailanthus (Ailanthus altissima) from China. The importance of IAS is likely to increase in the future if climate change predictions hold true. There are also 17 officially designated natural monuments (IUCN Category III), but no independent sanctuaries or protected landscapes, no national parks (IUCN PA Category II) and no sustainable use zones (IUCN PA Category VI).