The Tsimbazaza Park was created in August 29th, 1925 in the city of Antananarivo, capital of Madagascar. Initially it was named the "Botanical Garden of Tananarive" consisting of thematic areas. In 1935, the construction of animal cages and breeding in captivity began. His name has changed "Parc Botanique et Zoologique de Tananarive". In 1947, it was the only "National Research Center" in Madagascar and worked in collaboration with the Overseas Scientific and Technical Research Office (ORSTOM). In 1993 after having its status, it took the name "Parc Botanique et Zoologique de Tsimbazaza (PBZT)" until today and under the supervision of the Ministry of Higher Education and Scientific Research. It is made up of four departments: Fauna, Flora, Environmental Conservation Education and finally Administrative and Financial. The TAN Herbarium belongs to the Flora Department, particularly at the Herbarium Division. It is one of the three national reference Herbaria existing in Madagascar. The Herbarium Room was created around 1950. The first extension, funded by the Winslow Foundation with the help of the Missouri Botanical Garden, was made in 2004. Currently, it is the largest herbarium of the western Indian Ocean. The TAN herbarium consists of three rooms and two storage rooms. It contains Angiosperms, Gymnosperms, Ferns, Mosses and some species of Lichen. The oldest known collection is dated from 1831. The total number of herbarium specimens to be conserved is estimated to 258,000 of which 200,000 are mounted with 177,000 classified in the cabinets and 23,000 unclassified and the remaining 50,000 are unmounted. Currently 850 type specimens were recorded. The Herbarium TAN is one of the largest places that conserves the biodiversity of Madagascar. It is a laboratory where researchers and students draw information for their work. Each year, there are at least twenty students doing their internships. This part will concern the Rubiaceae family which is among of the largest represented plant family in Madagascar.