Abstract
The inflorescence of Apium graveolens is a compound umbel, with secondary divisions known as umbellets. Each umbellet bears flowers and peripheral flowers develop first showing centripetal development which is typical of the Apioideae. Flowers are hermaphrodite but protandrous. Anthesis as well as dehiscence of anthers is centripetal and sequential within the umbel as well as umbellet. Anther dehiscence and stigma receptivity are asynchronous. Although self compatible Apium graveolens practices a mating system which is a blend of autogamy and xenogamy. Pollen grains are longiaxial in celery.
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