Studies on Under-explotied Ornamental Plants in Diperocarp Forests of the Northeastern Thailand

Abstract

The survey, collection and identification of under-exploited ornamental plants both in community dipterocarp forests and protected area of the northeastern of Thailand were made in 19 provinces namely Loei, Nong Bua Lamphu, Chaiyaphum, Nakhon Ratchasima, Khon Kaen, Udon Thani, Nong Khai, Nakhon Phanom, Sakon Nakhon, Mukdahan, Kalasin, Maha Sarakham, Roi Et, Yasothon, Ubon Ratchathani, Amnat Charoen, Si Sa Ket, Surin, and Buri Ram. The studies were carried out during July, 1999 to March, 2004 by specimen collection, plant characters compilation with their habit, habitat, spore forming, flowering and fruiting stages. All of 21 families 47 species. Were devided into two main groups namely non-flowering with 3 families and 5 species and flowering plants wi th 18 families 42 species. The results showed that the non-flowering as concised 2 families of ferns as follows: of 1 species of Davalliaceae and 3 species of Parkeriaceae and 1 family, 1 species of gymnosperms. The flowering plant as concised of two dicots with 12 families and 32 species and monocots with 6 families, 10 species as followa : 1 species of Alangiaceae 3 species of Apocynaceae, 1 species of Combretaceae, 1 species of Convolvulaceae 2 species of Dipterocarpaceae, 1 species of Hypericaceae, 12 species of Leguminosae, 1 species of Lentibulariaceae, 4 species of Malvaceae, 3 species of Melastomaceae, of 2 species of Rubiaceae, 1 species of Thunbergiaceae, 1 species of Burmanniaceae, 1 species of Costaceae, 1 species of Eriocaulaceae, 4 species of Orchidaceae, 1 species of Xyridaceae 2 species of and Zingiberaceae respectively.