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Floristic regions of Thailand

In all of his publications on Thai orchids, Seidenfaden referred to the seven floristic regions of Thailand by a sequence of Roman numerals. In The Seidenfaden Database of Orchids and in Flora of Thailand, the same regions are referred to as "northern", "north-eastern" etc. However, in the subsections on species occurrence in some of the Flora of Thailand instalments, the seven floristic regions are designated by Roman numerals, using a numbering system that is different from the system used by Seidenfaden. The Flora of Thailand numbering system has been adopted by a number of authors (including orchidologists such as Obchant Thaithong) who have used them in other publications. The different numbering systems are compared below:

Part of Thailand
Seidenfaden
Flora of Thailand
Northern (N)
I
I
North-eastern (NE)
II
II
Eastern (E)
III
III
Central (C)
IV
V
South-eastern (SE)
V
VI
South-western (SW)
VI
IV
Peninsular (PEN)
VII
VII
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