Abstract
The pollen morphology of 41 species belonging to 19 genera of the tribe Isertieae sensu lato was investigated with LM and SEM. The problematic tribal delimitation and classification is reflected in the wide variation in many pollen morphological characters within the study group. This paper focuses on the recognition of distinct characters and states to describe this morphological variation. Nineteen pollen characters were retained for cladistic analysis. Coding problems for heterostylous species with pollen dimorphism are discussed. The palynological observations are confronted with existing hypotheses on phylogenetic relationships based on morphological and rbcL data. The tribes Mussaendeae (truncate ectocolpus ends, endocolpi with diverging ends) and Isertieae (relatively large pollen, endexine reduced to granular `islands', endocolpi with thickened lateral margins) in their new circumscription are supported palynologically. The Sabiceeae show more heterogenous pollen and do not appear as a well defined group in our analyses.
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