Floral organogenesis of Chloranthus sessilifolius, with special emphasis on the morphological nature of the androecium of Chloranthus (Chloranthaceae) |
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Authors: | H-Z Kong A-M Lu P K Endress |
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Institution: | (1) Laboratory of Systematic and Evolutionary Botany, Institute of Botany, The Chinese Academy of Sciences, Beijing, China, CN;(2) Institute of Systematic Botany, University of Zurich, Zurich, Switzerland, CH |
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Abstract: | Floral organogenesis of Chloranthus sessilifolius K. F. Wu is described. The inflorescence primordium is dome-like in the beginning and then elongates, and bract primordia
initiate almost decussately. Each floral primordium, arising from the axil of a bract, soon becomes a scale-like structure,
with three primordia of androecial lobes originating from its abaxial part, and the gynoecial primordium in adaxial position.
As the androecial lobes become more distinct, four thecae are already in differentiation, and the gynoecial primordium appears
as a shallow disc. The androecial lobes do not extend their length until the thecae approach maturity and the stigma is differentiated.
The androecial lobes are united at all the stages of development, and the entire androecium falls off as a unit at the end
of anthesis. Based on these results, combined with published evidence from neobotany, palaeobotany and phylogenetic studies,
the morphological nature of the androecium of Chloranthus is further discussed. Our studies support the viewpoint that the androecial structure of Chloranthus may have arisen by splitting of a single stamen with 2 marginal thecae.
Received May 2, 2001 Accepted December 18, 2001 |
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Keywords: | Key words: Chloranthaceae Chloranthus floral organogenesis androecium morphological nature |
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