The vascular plant in Sa Mu mountain of Bac Huong Hoa Natural Reserve, Quang Tri province was surveyed and identified with 542 species belonging to 116 families in 5 divisions. Among them, Lycopdiophyta with 4 species, 2 genera, 2 families
Equysetophyta with 1 species, 1 genus, 1 family
Polypodiophyta with 50 species, 24 genera, 13 families
Pinophyta with 6 species, 5 genera, 3 families
oliophyta with 481 species, 236 genera, 97 families. Especially, the Magnoliophyta is the most diverse representing 88.74 percent ofthe total species
88.06 percent of the total genera
83.62 percent of the total families. The Magnoliopsida with 82 families, 183 genera and 409 species, this is the more diverse in Magnoliophyta. In Sa Mu mountain of Bac Huong Hoa Nature Reserve there are 11 threatened species listed in the Red Data Book of Vietnam (2007), especially Cinnamomum glaucescens in CR level
4 species in the IUCN (2010) and 9 species in Decree No.32/2006/ND-CP by Government (Paphiopedilum sp., Anoectochilus cetaceus, Asarum balansae in IA level). The number of useful species of the Sa Mu mountain flora is categorized as follows: 214 species as medicinal plants, 118 species for timber plants, 58 species for food and food stuffs,...