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Resupination in Flowers of Two Dendrobium (Orchidaceae) Hybrids: Effects of Nodal Position and Removal of Floral Segments

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Removal of floral segments from Dendrobium (Orchidaceae) flowers indicates that resupination may be regulated or is at least affected by pollinia and/or stigmas. Other floral segments do not appear to have a direct effect. However, excision of the perianth may result in senescence and death, which could be caused by desiccation and/or ethylene evolution.

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