| Pak. J. Bot., 37(4): 785-796, 2005. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
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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. Department of Botany, University of Karachi, Karachi-75270, Pakistan. |
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