In-land sand-dune area in Hai Thien commune, Hai Lang district, Quang Tri province contains 180 flowering plant species in 41 orders, 61 families, and 138 genera. Magnoliopsida is more dominant than Liliopsida in all taxa. The dominant plant families are Poaceae and Asteraceae, each of which has 14 species. In total 180 flowering plant species, there are 78 medical plant species, accounting for 43.33%; 28 ornamental plant species–15.56%; woody plants and food plants consist of 24 species–13.33%; and essential oil plants and aromatic plants have a very small share of 6 species, making up for only 3.33% of the total species. The life-form formula of the flowering plants in the study area is 53.33 Ph + 7.78 Ch + 2.78 Hm + 17.78 Cr + 18.33 Th. This life form formula with 53.33% of the Phanerophytic form reveals that the weather of the in-land sand-dune area is harsh.
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