Abstract
A brief review of heterostylic species of Rubiaceae has been made. Counts of natural populations of the distylicOldenlandia umbellata have been made from six localities. Out of a total of 1,894 plants counted, there were 1,093 long styled plants and 801 short styled plants. Long and shortstyled plants are self incompatible. Seeds are set only in legitimate crosses. Biometrical data pertaining to the pollen grains of the long and short styled plants has been analysed. Short styled pollen grains are larger than long styled. Measurements of styles, anthers, and stigma papillae are also given.
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