Pollen morphology of Euchaetis and Macrostylis (Diosminae-Rutaceae) and its taxonomic implications

Pollen morphology of Euchaetis and Macrostylis, both members of the taxonom ically problematic subtribe Diosminae (Rutaceae), was investigated by LM, S EM and TEM. Here we report on the taxonomic significance of pollen morpholo gy based on a comparative study of 28 infrageneric taxa. Three pollen types were found, namely reticulate (common to both genera), perforate (in Eucha etis) and striato-reticulate (in Macrostylis). Pollen data provide evidence of relationships between the two genera as well as with other genera, and further support for the macromorphological evidence suggesting the generic re-classification of the Diosminae.