|The vegetation in the Periyar Tiger Reserve includes evergreen, semi-evergreen and moist deciduous forests, grasslands, an aquatic eco-system and eucalyptus groves. There are 1966 varieties of flowering plants, including angiosperms. Both dicots and monocots have been included in this count. There are about 171 grass species and 140 species of orchids in the region.
The richness of the flower wealth is so outstanding that it constitutes more than 50 percent of the entire flower wealth of Kerala, which is about 3800 species. Teak, Rosewood, Terminalia, Eucalyptus, Sandalwood, Jacaranda, Mango, Jamun, Tamarind, Banyan, Pipal, Plumeria, Gulmohar and bamboo are some of the trees found here. The three main endemic plants are Mucuna pruriens thekkadiensis, Habenaria periyarensis and Syzygium periyarensis. Rare plants like the Podocarpus wallichianus, the only South Indian conifer, are also found in the reserve.
More than 350 medicinal plants, including trees, shrubs and herbs, have been identified at the Periyar Tiger Reserve, mainly in the evergreen and moist deciduous forests. Plants belonging to the family of Fabaceae and Euphorbiaceae are the major ones among them. Glory Lily (Gloriosa superba) and Kino Tree (Pterocarpus marsupium) are two plants with medicinal value found here.
The Periyar Tiger Reserve is surrounded by tea, cardamom, pepper and coffee plantations. The arresting green of the plantations add considerable charm to the region.