Labellum vasculature in some monocotyledonous taxa

Document Type : Original Article

Authors

1 Botany department, Faculty of Science, Ain Shams University, Cairo, Egypt

2 Botany department, faculty of science ,Ain Shams University, Cairo, Egypt

10.21608/taec.2025.423197.1064

Abstract

The vasculature and structural nature of the labellum are diagnostic and highly significant across different taxa within monocotyledonous plants. In this study, the floral vasculature of seven taxa belonging to Cannaceae, Marantaceae, Zingiberaceae (Zingiberales), and Orchidaceae (Asparagales) were examined using light microscopy (LM) to better understand and characterize the nature and structure of the labellum in selected monocot taxa. The results revealed that the labellum vasculature of Dendrobium nobile (Orchidaceae) was notably distinct from that of the other studied taxa. The labellum supplied by three separate vascular bundles: one posterior inner bundle and two postero-lateral bundles, corresponding to the median and marginal regions of the labellum. In Canna × hybrida and C. indica (Cannaceae), the labellum vasculature incorporated two bundles: one derived from the carpellary dorsal trace and another from the antero-lateral carpellary septal trace. The floral vasculature of Maranta leuconeura (Marantaceae) showed that the labellum was supplied by a single carpellary septal trace, which subsequently divided to form median and marginal bundles. For Alpinia zerumbet and Hedychium coronarium (Zingiberaceae), the labellum was supplied by three distinct vascular bundles: two antero-lateral carpellary septal bundles and one anterior carpellary dorsal bundle.

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