What are two kinds of plants in Yellowstone National Park?

* Alpine fir (_Abies lasiocarpa_): This evergreen conifer is found in high-altitude areas of the park, typically above 8,000 feet. It is a long-lived tree, with some specimens living for over 500 years.

* Lodgepole pine (_Pinus contorta var. latifolia_): This is the most common tree species in Yellowstone National Park, found at elevations from 6,500 to 10,000 feet. It is a fire-adapted species, with thick bark that protects it from flames.