Synchronized dichogamy and dioecy in neotropical Lauraceae Article Received: 09 December 1983 Accepted: 05 May 1984 DOI:
Cite this article as: Kubitzki, K. & Kurz, H. Pl Syst Evol (1984) 147: 253. doi:10.1007/BF00989387 Abstract
In hermaphrodite neotropical
Lauraceae a highly evolved dichogamous system is present which represents a kind of temporal dioecy. This system involves the existence of two flower morphs which are characterized by reciprocal phases of receptivity of the stigmas and pollen release. In some genera ( Persea, Cinnamomum), nectar is produced as a reward for the flower visitors, while in other genera ( Aniba, Clinostemon, Licaria), nectar is absent and pollen seems to be the only reward. This implies that in this case the flowers in the female stage must be deceptive flowers. In dioecious species of the genera Ocotea and Nectandra, both the male and female flowers attract the visitors with nectar. The pollen-ovule ratio of the Lauraceae is comparatively low. — The type of reproductive system that characterizes the Lauraceae, comprising functional dioecy, small, inconspicuously coloured flowers, pollination by small bees, and large, one-seeded fruits dispersed by birds, is quite prominent among trees of various families in the tropical lowland forest. The relationship between the different modes of flowering within the Lauraceae and the causes for the correlation of their reproductive traits are discussed. Key words Angiosperms Lauraceae Meliponinae Pollination dispersal reproductive biology dichogamy dioecy Neotropics References
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