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In page Vanilla:

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The distinctively flavored compounds are found in the fruit, which results from the pollination of the flower. These seed pods are roughly a third of an inch (8 mm) by six inches (15 cm), and brownish red to black when ripe. Inside of these pods is an oily liquid full of tiny seeds.[4] One flower produces one fruit. V. planifolia flowers are hermaphroditic: they carry both male (anther) and female (stigma) organs. However, self-pollination is blocked by a membrane which separates those organs.[citation needed]