Raflesia arnoldii is usually known as Raflesia arnoldi is also called as patma flower. This flower has bad smell and is one of rare species , one of Indonesian flowers beside jasmine and anggrek bulan (orchid)
This flower was found in 1818 in Sumatera forest. A guide worked by Dr Joseph Arnold found the flower, when he was on expedition led by Thomas Stamford Raffles. The flower name derives from both men name, Raffles and Arnold. Rafflesia arnoldii is a obligate parasite flower. It grows on branch of liana from Tetrastigma family. The flower has no leaves that it can not undertake photosynthesis. The nutrition needed is taken from the host tree. It has no root or stock. Only the flower which can be seen and only in certain period of time.
Raflesia arnoldii has wide flower, it has 5 flower and when it blooms the size can reach to 70 to 110 cm and height 50 cm and weight is 11 kg . On the bottom, in the middle part there is a jar shape part where stamens or pistil located, depends if it is female or male.
Di dasar bunga di bagian tengah berbentuk gentong terdapat benang sari atau putik, tergantung jenis kelamin bunga. keberadaan putik dan benang sari yang tidak dalam satu rumah membuat presentase keberhasilan pembuahan yang dibantu oleh serangga lalat sangat kecil, karena belum tentu dua bunga berbeda kelamin tumbuh dalam waktu bersamaan di tempat yang berdekatan. It takes 9 months for the flower to grow, but it obly blooms for 5 to 7 days, and after that raflesia will be dry and die.
Raflesia is an endemic flower in Sumatera, in Bengkulu. Yet several places such as Aceh and Malaysia have reportes that then flower can be found there, though maybe other species of raflesia. Several locations where raflesia arnoldii located are :Kerinci Seblat National Park, Bukit Barisan NP, Pusat pelatihan Gajah Seblat (North Bengkulu) and Padang Guci.
Currently the flower can not be cultivated ex situ. From 30 species of Rafflesia, only rafflesia patma can be cultivated ex situ in 2010 in Kebun Raya Bogor. By IUCN, this flower is not in endanger status, only Rafflesia nagnifica growing in the Philippines.