Rafflesia arnoldii which then pollinate the rare plant. It is not to be confused with the titan arum, "Amorphophallus titanum", which is also commonly referred to as the "corpse flower" because of its repulsive odor. "Rafflesia arnoldii" is rare and fairly hard to locate. It is especially difficult to locate the flower in forests, as the buds take many months to develop and the flower lasts for just a few days. The flowers are unisexual and thus proximity of male and female flowers is vital for successful pollination. These factors make successful pollination a rare event. When "Rafflesia" is ready to reproduce,
Bukit Barisan Selatan National Park section is a peninsula. It is covered by montane forest, lowland tropical forest, coastal forest and mangrove forest. Plants in the park include Nipa palm, "Casuarina equisetifolia", "Anisoptera curtisii" and "Gonystylus bancanus", as well as Sonneratia, Pandanus, Shorea and Dipterocarpus species. Large flowers in the park include the "Rafflesia arnoldii", "Amorphophallus decus-silvae", "Amorphophallus titanum" and the world's largest orchid the "Grammatophyllum speciosum". The park is home to many endangered and threatened species, including: Other animals in the park are the Malayan tapir, siamang, Sumatran surili, sun bear and lesser mouse-deer. There are over 300 species of bird in the park,