Stem anatomical studies of four species; clytostoma binatum, Mansoa alliacea, Doxantha unguis cacti, Pyrostegia venusta coming under tribe. Bignonieae (Bignoniaceae) were carried out and compared. Tribe Bignonieae shows anomalous secondary growth and special phloem wedges. Taxonomic confirmation depends on morphological and floral features.Based on stem anatomical characters a diagnostic key prepared which can be used as supporting tool for taxonomic delimitation of species.
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