Plant Groups. NPS Image / Lian Law. Plant Groups - Denali National Park & Preserve (U.S. National Park Service) There are only a handful of trees that are found in Denali. Learn what trees are here and how they survive in the frigid subarctic. Shrubs and Dwarf Shrubs. There is a much higher diversity of shrub species in Denali compared to trees. Learn more about the shrubs that can be found in the park.