Quảng Bình Province is endowed with biodiversity, especially typical of Annamites eco-region. According to the results of initial surveys, the primary tropical forest in Phong Nha-Kẻ Bàng is home to 140 families, 427 genera, and 751 species of vascular plants, of which 36 species are considered endangered and listed in the Vietnam's Red Data Book. The most common tree species in this park are "Hopea sp.", "Sumbaviopsis albicans", "Garcinia fagraeoides", "Burretiodendron hsienmu", "Chukrasia tabularis", "Photinia arboreum" and "Diospyros salletii". Seedlings can only grow in holes and cracks in the limestone where soil has accumulated, so in general regeneration after disturbance is slow. The forest type in this national park is dominated by evergreen tree species with scattered deciduous trees such as "Dipterocarpus kerri", "Anogeissus acuminata", "Pometia pinnata" and "Lagerstroemia calyculata". In Phong Nha-Kẻ Bàng, the dominant plant families are the Lauraceae, Fabaceae, Theaceae and Rosaceae, with some scattered gymnosperms such as "Podocarpus imbricatus", "Podocarpus neriifolius", and "Nageia fleuryi".