PJB-2005-93
POLLEN FLORA OF PAKISTAN-XLVII. EUPHORBIACEAE
ANJUM PERVEEN AND M. QAISER
Abstract
Pollen morphology of 40 species representing 6 genera viz., Andrachne, Chrozophora, Dalechampia, Euphorbia, Mallotus and Phyllanthus of the family Euphorbiaceae from Pakistan has been examined by light and scanning electron microscope. Euphorbiaceae is a eurypalynous family. Pollen grains usually radially symmetrical, isopolar, prolate-spheroidal to sub-prolate or prolate often oblate-spheroidal, colporate (tri rarely 6-7), colpi generally with costae, colpal membrane psilate to sparsely or densely granulated, ora la-longate, sexine as thick as nexine or slightly thicker or thinner than nexine. Tectal surface commonly reticulate or rugulate - reticulate rarely striate or verrucate. On the basis of exine pattern 5 distinct pollen types viz., Andrachne-aspera - type, Chrozophora oblongifolia-type, Euphorbia hirta-type and Mallotus philippensis - type and Phyllanthus urinaria - type are recognized.
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