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Inflorescence and flower development in the Hedychieae (Zingiberaceae): Hedychium

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Bruce K. Kirchoff, Associate Professor (Creator)
Institution
The University of North Carolina at Greensboro (UNCG )
Web Site: http://library.uncg.edu/

Abstract: Flower organogenesis in Hedychium gardnerianum and Hedychium coronarium begins with the sequential formation of the sepals on a rounded—triangular apex. Growth in three regions of the apex, inside the sepals, produces three coamon petal — inner androecial primordia. Intercalary growth below and between these primordia produces a floral cup, the site of gynoecial formation. The coamon primordia separate to form petals and inner androecial members. After separation, the anterior inner androecial members fuse to form the labellum. The posterior member forms the polleniferous stamen. Up to this point in development, the flowers of H. coronarium are slightly ahead of those of H. gardnerianum. However, in H. gardnerianum, initiation of the two thecae of the stamen occurs iamediately following the separation of the coamon primordia, while thecae formation in H. coronarium is slightly delayed. These results show that the relative timing of developmental events can vary even over a short developmental period. Formation of the outer androecium takes place at the apices of a triangle formed by the inner androecial members. The anterior outer androecial member aborts soon after formation, whereas the posterior outer androecial members form the two petaloid staminodes that are found on the lateral sides of the labellum in the mature flower.

Additional Information

Publication
Canadian Journal of Botany 75: 581-594
Language: English
Date: 1997
Keywords
Flower development, Flower structure, Inflorescence, Stamen, Zingiberaceae, Hedychium