Thailand covers an extensive area of about 513,000 sq.km. in the middle of the Southeast Asian mainland, with very rich and diversified vegetation of about 15,000 plant spectes, ranging from the high mountains in the northwestern hill tracts along the Tanasserim Range to the hill plateau of the northeastern region, through the Central Plain into the eastern corner adjacent to Kampuchea ; and into the peninsular region south of the lsthmus of Kra to the Malaysian border.

It is, therefore, not possible to present all of this botanical diversity, and only a handful, which are deemed to be of delightful attraction, are included here. The country has a great diversity of folwering plants, coverting a large area, from 96°-105° 5´ E and 6°-16° 5´ N; the vegetation is thus varied and can be classified into two main forest types: evergreen and deciduous