Seeds from three sympatric populations of Calotropis procera (Ait.) R. Br., identified on the basis of variation in coronal structure, were kept separately for germination under different environmental conditions. The general trend of percentage germination in laboratory conditions for the population was A-type > B-type > C-type. A field survey showed the proportion of A-type, B-type and C-type plants in nature to be roughtly 1:1:4. It is suggested that the dormancy characteristics of a proportion of the C-type population seeds help to explain the apparent paradox enabling viable seed to survive until conditions are more appropriate.
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Amritphale et al. (1984) studied this question.