The building consists of 3 floors, which have 4,238 square metres in total spaces, with the following facilities: 

Level 1 

Kasem Room (Kasem Chandraprasong) serves administrative affairs and general contact of the research group. 

Ampai Library (Ampai Yongbunkerd) has more than 2,000 titles of Thai and foreign books, academic papers, journals and printing materials on herbarium, specifically plant taxonomy. 

Jarey Sadakorn Room compiles important documents and preserved books.

Lakshnakara Room (M.C. Lakshnakara Kashemsanta) houses the foundation stone used in the opening ceremony in which Princess Maha Chakri Sirindhorn signed her name on. The room exhibits academic knowledge on herbarium and relevant research works.

Burachat Chaiyakorn Room serves as herbarium and plant genetic conservation laboratories. 

Level 2 

Founded in 1920, Bangkok Herbarium Museum is the first of its kind in Thailand. Since the late era of King Rama VI, the museum has housed examples of plant species to serve the study of plant taxonomy, as well as to examine scientific names of plants, or epithet, that accounted more than 80,000 numbers by which Dr. A.F.G. Kerr, a Scottish physician, had paved the way for the survey and collection of plant species. Majority of plant sampling are dried samples and early prototypes of plant sampling used for the definition of scientific names. Almost all of these names were found in Thailand for the first time. In addition, there is a laboratory that serves the operation of specialists and visitors who has a necessity to use plant sampling.  

Craib Room compiles type specimens that served as the first reference example for the definition of scientific names.  

Kerr Room stores historical documents on herbarium study in Thailand and images of Thai plants. 

Rabil Room, Noey Room and Put Room are botanical laboratories. 

Level 3 

The floor has the study room of Princess Maha Chakri Sirindhorn, the Chairman of Plant Genetic Conservation Project of Thailand, conferred to the Department of Agriculture with the purpose to serve as a part that implements Her Royal Highness’s initiative in establishing plant genetic resources of the museum. 

Ratchanee Chamchumras Room serves as processing room and includes the computer network of the Plant Genetic Conservation Project under the Royal Initiative of Princess Maha Chakri Sirindhorn. The room also stores plant genetic resources.     

Kasin Room (Kasin Suvatabundhu) is a meeting room that serves the education of herbarium and plant conservation for general public.    

Sakol Room has the collection of plant parts preserved in liquid preservatives. 

Native Herbarium Room compiles native plants, herbs, spices, equipment and tools, which contain wooden elements. The north side has a sampling room that stores seed, fruit and flesh of plants.

Ratchanee Chamchamrus Room stores information on Plant Genetic Conservation Project under the Royal Initiative of Princess Maha Chakri Sirindhorn and plant genetic resources.

Source:

http://www.doa.go.th/pvp/index.php?option=com_content&view=article&id=38&Itemid=119