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POLLEN FLORA OF PAKISTAN -XLIV. RHAMNACEAE

ANJUM PERVEEN AND M. QAISER

Abstract: Pollen morphology of 11 species representing 5 genera of the family Rhamnaceae from Pakistan have been examined by light and scanning electron microscope. Rhamnaceae is a stenopalynous family. Pollen grains are generally free, radially symmetrical, isopolar, colporate. Shape of pollen grains are sub-prolate or oblate-spheroidal rarely prolate. Sexine thicker or thinner or as thick as nexine. Tectum striate to striate-rugulate or rugulate to reticulate often psilate.
On the basis of tectum types, 5 distinct pollen types viz., Berchemia pakistanica -type, Rhamnus prostrata - type, Sageretia thea-type, Ziziphus mauritiana type and Ziziphus oxyphylla - type are recognized. The pollen morphology of the family Rhamnaceae is significantly helpful at generic and specific level.
 

Department of Botany, University of Karachi, Karachi-75270, Pakistan.