1,050 different species of tree out of 7,000 total species and over 1,000 species of insect life are found within the small sample area of 52ha. The park covered with more than half of the area with rich natural mixed Dipterocarp forest, where huge, tall Dipterocarp trees such as Kapur, Meranti, Kempas and Selangan Batu.  Shorter trees like Rhu Bukit, Selunsur Bukit, low shrubs, pitcher plants and orchids are found in the Kerangas forest.  Apart from the various tree species, the park is very rich in other plant species such as ferns, gingers, vines, palms, mushrooms, moss and lichen, flowering and fruiting shrub trees, climbers and creepers.  The fungi of Lampir hill are numerous and remarkable, this including the phosphorescent (illuminate) species that glows in the dark.