_:b1215847 "Treeless, level, or gently rolling plains characteristic of arctic or subarctic regions, having a permanently frozen subsoil, and usually supporting low growing vegetation such as lichens, mosses, and stunted shrubs."^^ . _:b1215847 "ADL:FTT"^^ . _:b1215847 . _:b1215847 . _:b1215847 .