An Ecological Study of Alstonia Venenata R.Br. (Apocynaceae: Rauvolfioideae) and Cryptolepis Buchanani R.Br. ex Roem. & Schult. (Apocynaceae: Periplocoideae)

Abstract

_Alstonia venenata_ and _Cryptolepis buchanani_ with shrubby habit occupy different locations but both bloom during summer season. _A. venanata_ flowers facilitate autonomous autogamy. Butterflies and honey bees visit the flowers during forenoon period and effect self- and cross-pollination. _C. buchanani_ flowers are unattractive to the flower visitors any fruit set is exclusively a function of autonomous autogamy. In both species, fruit is a paired follicle which sheds seeds when dry and the seeds thus liberated are dispersed by wind.