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Aspects of floral development in Caladium bicolor (Araceae).
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- Abstract:
In the spadix of Caladium, there is a clearly recognizable intermediate zone consisting of sterile male flowers. The transition between the female zone and the male sterile zone is more or less abrupt. During the early stages of development of the inflorescence, a few atypical bisexual flowers between the female zone and the male sterile zone are recognizable. These atypical flowers display a variety of forms. However, in all cases, the staminate portion of the flower is located near the male zone and the gynoecial portion near the female zone. The undeveloped synandroidral portion and the rudimentary gynoecium belong to the same meristematic unit and can be viewed as a single whorl. The early stages of development of atypical bisexual flowers in Caladium and Philodendron are relatively similar and therefore represent an intermediate form between female and male sterile flowers.Key words: inflorescence, homeosis, gradient, flower.Dans le spadice des Caladium, il y a une zone intermédiaire bien définie constituée de fleurs mâles stériles. La transition entre la zone femelle et la zone mâle stérile est plus ou moins rapide. Au cours des premières étapes du développement de l'inflorescence, on peut déceler quelques fleurs bisexuées atypiques entre la zone femelle et la zone mâle stérile. Ces fleurs atypiques montrent une variété de formes. Cependant, dans tous les cas, la portion staminée de la fleur est localisée près de la zone mâle, et la portion gynécique près de la zone femelle. La portion synandroïde non-développée et le gynécée rudimentaire appartiennent à la même unité méristématique et peuvent être considérés comme un seul verticille. Les premières étapes du développement des fleurs bisexuées atypiques chez les Calladium et les Philodendron sont relativement similaires, et conséquemment représentent une forme intermédiaire entre des fleurs femelles et des fleurs mâles stériles.Mots clés : inflorescence, homéose, gradient, fleur.[Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Abstract:
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