The canopy-wise distribution of main species is given below.

Top Canopy:

The lofty trees of the top canopy might reach a height of 40 m or more. The main species are Palaquium ellipticum (Pali), Calophyllum polyanthum (Poon-spar kattupunna, Punnapai), Mesua ferrea (Nanku churuli Vayanavu), Cullenia exarillata (vediplavu, Mullenpali, Kuranguplavu), Dipterocarpus indicus (Kalpayin, Karangili  vellaayani), Artocarpus hirsutus (Angili, Ayani), Mangifera indica (Mavu, Moochi), Vateria indica (vellappayin, Kunthrikkappayin), Hopea parviflora (Thambakam, Kambakam, Uruppu), Dysoxylum malabaricum (Vellakil, Akil), Myristica fatua (Kagthappayin), Syzygium spp.  (Njara, chavaran, jaral) and Machilus macrantha (Ooravu, Kulamavu).

Middle Canoppy:

Middle canopy trees normally attain a height of about 20 m or more.  The common species are Aglaia lawii (Karakil, Vellacheeralam), Diospyros spp. (Karimaram, Vakkane, Kattupanachi Thumbimaram), Elaeocarpus glandulosus (Kara, Thamari), Garcinia gummi-gutta (Kodappuli, pinar), Garcinia spicta (Manjananku), Hydnocarpus pentandra (Marotti, Neeutti), Knema attenuata (Chorappayin, chorappathiri), Otonephelium stipulaceum (Poripoovam), Syzigium lanceolatum (Njaval), Actinodaphne malabarica (Kambiliviringi, Neyaram), Drypetes roxburghii(Poothilanji), Drypetes confertiflora  (Kaduvapidukkan), Glochidion arboreum and Glochidion ellipticum (Njanjetti), Litsea sp.  (Maravettithali,  ungakanni), Mallotus ferrugineus (Chenkolli, Kazhuvakkaradi), Meliosma pinnata (Kallavi, Thakin),  Meliosma simplicifolia (Kolakattamaram) etc.

Lower Canopy:

This canopy usually consists of small trees and shrubs.  The main species are Atalantia racemosa (Kattunarakam, Kattunaragom), Baccaurea courtallensis (mootilpazham mootilthoori), Meiogyne ramarowii (Panthalmaram chavi), Orophea erythocarpa, Orophea uniflora, Aporusa acuminata (neervetti), Ardisia pauciflora (Muttamaram), Dendrocnide sinuata (Anayeviratti, Kattanplavu), Gomphandra coriacea (Kambilichedi chottamaram), Lepisanthes senegalensis (Eekkoli), Lepisanthes tetraphylla (Kulapunna, Naikolli), Lasianthus acuminatus, Strobilanthus  species,  etc.

Climbers:

Giant climbers or lianas are found on the lofty trees of the evergreen forests. The curious gymnosperm Gnetum ula (Karutha odal) a large climbing shrub is of rare occurrence.  The common climbers are Calamus rotang (Chural), C.travancoricus (Arichural), Acacia concinna (Cheeya Kayi), Artobotrys zeylanicus (Koluvaravalli) Derris brevipes (a gigantic creeper), Entada rheedii (Malamanchadi Paranda, Kakkavalli), Strychnos bourdilloni (Valli-kanjiram), Strychnos rheedii (Mothira-Kanjiram), Ventilago bambaiensis.

Epiphytes:
The epiphytes growing here moStly belong to the sciophytic group, confined to the cooler, darker and moist micro climates within the forest canopy. Orchids and ferns are also common.  A beautiful pendulous Lycopodium species, handsome scarlet flowers of Aeschynanthus perrottetic, pale red coloured fleshy leaves of Medinella beddome and M.malabarica are noticeable with many epiphytes, which are attached to the host trees by haustoria.  Helixanthera intermedia, Seurrule parasitica etc. provide a common sight.

Ground Vegetation:

It is poor, but an interesting ideal habitat of saprophytes, terrestrial orchids and molds.  Begonia malabarica (Janaamkulli, Kaiyalapulliyan), Begonia crenata, Ophiorrhiza mungos (Avilpori), Geophila reniformis, Argostemma courtallense etc.  are some common  herbs growing here.  Undesirable weeds like Ageratum conyzoides, Eupatorium odoratum, Parthenium hyterophorus (congress grass) etc. are also found invading the area.

Interestingly, a new and distinct genus and species of Burmanniaceae called Haplothismia exanulata was discovered from evergreen high forests of sanctuary by   Airy Shaw in 1951.