Pollen morphology of Phyllosma and Sheilanthera (Diosminae : Rutaceae) andits taxonomic implications

Phyllisma (two species) and Sheilanthera (one species) are members of the t axonomically problematic subtribe Diosminae, Rutaceae. Pollen morphology of all three species was investigated by LM, SEM and TEM to shed light on the ir relationships to other genera of the subtribe. Sheilanthera a shares pol len morphological features with many other species in the subtribe, but the pollen of Phyllosma is distinctive. Possible relationships between Sheilan thera ir and Acmadenia, and between Phyllosma and Agathosma are suggested. The macromorphological characters of the species correspond to the pollen m orphology.