_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.
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Raju et al. (2024) studied this question.
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