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Reproduction and floral biology of jatropha gossypifolia euphorbiaceae



Reproduction and floral biology of jatropha gossypifolia euphorbiaceae



Revista Brasileira de Biologia 44(2): 159-168



J. gossypifolia L., a perennial shrub well adapted to semiarid regions, is commonly found in northeastern Brazil and cultivated in other areas quite adverse to the northeastern one. This taxon is monoecious, protogynous and self-compatible. The flowers are small, nectariferous and arranged in inflorescenes type cyme. The blossom is cycle occurring at every 2 mo. of the year. The great stigmatic area and the arrangement of reproductive organs are the most significant strategy of the pollinization proces. This taxon presents glands on the calyx margins, stipules, bracts and leaf margins. These glands secrete a resinous kind of substance and offer them to Tetragonisca angustula (Latr.) as reward, and must also be correlated with the defense of the plant. J. gossypifolia is visited by many insects. In cultivated areas its effective pollinator is Plebeia mosquito (Smith). Other visitors may be eventual pollinators except ants which act as nectar thieves. This species is geitonogamous and xenogamous but the latter is predominant. The high percent of fruits and fertility index show the reproduction exit.

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Accession: 006315421

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