The researchers studied the forest vegetation on Mt. Ilwol in Korea using a method called Braun-Blanquet combined with TWINSPAN analysis. They found two main types of forest communities: arid mountainside and humid piedmont/valley. The arid type had 3 communities, including Rhododendron and Quercus, while the humid type had 3 communities like Tilia and Vitis. The most common plant family was Compositae. Quercus mongolica was the most abundant species, followed by Carex siderosticat and Fraxinus rhynchophylla. The forest had a variety of plant life forms, with the humid type having higher species diversity. Key trees included Pinus densiflora, Quercus mongolica, and Q. variabilis, while shrubs like Fraxinus sieboldiana and R. schlippenbachii were important too. Herbaceous plants like Carex siderosticta and Carex humilis were also significant.