Flora Periyar National Park
Tropical evergreen and semi evergreen forests constitute 74.6% of the total area of Periyar Tiger Reserve, followed by moist deciduous forests that form 12.7% and grasslands which are 1.5% and eucalyptus come under 7.1% of the area. Periyar Lake constitutes the rest of the area i.e., 3.5%.
Floral diversity
| Angiosperms | 1966 Spp. |
| Gymnosperms | 3 Spp. |
| Pteridophytes | 170 Spp. |
| Medicinal Plants | 350 Spp. |
Endemic Plants of PTR :
- Mucuna pruriens thekkadiensis
- Habenaria periyarensis
- Syzygium periyarensis
Forest Types :
- West coast tropical evergreen forests : Vateria indica, Cullenia exarillata, Hopea parviflora, Canarium strictum, Thottea siliquosa, Calamus vattayila, Gnetum ula, Impatiens parasitica … etc.
- West coast semi-evergreen forests : Artocarpus hirsutus, Bischofia javanica, Myristica dactyloides, Psychotria thwaitessii, Strobilanthus ciliatus, Jasminum flexile, Mucuna hirsuta … etc
- Southern moist mixed deciduous forests : Tectona grandis, Dalbergia latifolia, Grewia tiliifolia, Pterocarpus marsupium, Lagerstroemia microcarpa, Desmodium pulchellum, Helicteres isora, Pavetta indica… etc.
- Southern hilltop tropical evergreen forests : Syzygium gardneri, Litsea oleoedes, Hydnocarpus alpina, Drypetes wightii, Actinodaphne bourdilloni, Agrostistachys borneensis, Amomum muricatum … etc.
- Southern montane wet temperate forests : Actinodaphne campanulata, Rhododendron arboreum, Vernonia travancorica, Garcinia cowa, Syzygium parameswaranii, Symplocos pulchra ... etc.
- South Indian sub-tropical hill savannahs :Terminalia chebula, Careya arborea, Phyllanthus emblica, Themeda cymbaria, Chrysopogon hackelii … etc.
- Southern wet montane grasslands : Phoenix loureirii, Strobilanthus kunthianus, Hypericum mysorense, Arundinella ciliata, Tripogon bromoides… etc.
