Syzygium alternifolium is a species of plant in the family Myrtaceae. It is native to North Arcot, Cuddapah, Kurnool, and the Nagari hills, in eastern Chittoor district, India. It has alternate leaves. Syzygium alternifolium Walp. is a semi-evergreen mass-flowering tree species of dry deciduous forest in the southern Eastern Ghats of India. It is a mass bloomer with flowering during dry season. The floral traits suggest a mixed pollination syndrome involving entomophily and anemophily together called as ambophily. Further, the floral traits suggest generalist pollination system adapted for a guild of pollinating insects. The plant is self-incompatible and obligate out-crosser. The flowers are many-ovuled but only a single ovule forms seed and hence, fruit and seed set rates are the same. Bud infestation by a moth, flower predation by the beetle, Popillia impressipygaand bud and flower mounds significantly limit fruit set rate. The ability of the plant to repopulate itself is limited by the collection of fruits by locals due to their edible nature, short viability of seeds, high seedling mortality due to water stress, nutrient deficiency and erratic rainfall or interval of drought within the rainy season. Therefore, S. alternifolium is struggling to populate itself under various intrinsic and extrinsic factors. (© The IUCN Red List of Threatened Species: Syzygium alternifolium – published in 2015. http://dx.doi.org/10.2305/IUCN.UK.2015-2.RLTS.T50130683A50131435.en in 2015 )documented that S. alternifolium is an endemic and globally endangered species as per the criteria of IUCN. S. alternifolium is a fruit tree of great timber, medicinal and economic importance. Timber is used for making furniture and agricultural implements. In recent years, its population size is declining due to cut down of trees and collection of fruits leaving less possibility for the plant to repopulate itself in its natural area. Keeping this in view, the present study is contemplated to describe the chronological events of pollination biology of S. alternifolium (Wight) Walp. (Myrtaceae). The observational and experimental data collected on the studied aspects are discussed in the light of relevant existing information on other Syzygiumspecies. A population of some individuals of S. alternifolium located in the hill and slopes of Tirumala a part of Seshachalam Hills and this region is declared in 2011 as Seshachalam Biosphere Reserve by the Ministry of Environment and Forests, Government of India. The reserve lies between 13038”–13055”N & 79007”–79024”E. It is spread over 4756 km2 in both Kadhapa and Chittoor districts of southern Andhrapradesh. The vegetation