| Pak. J. Bot., 39(4): 999-1015, 2007. | Back to Contents | ||||
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POLLEN FLORA OF PAKISTAN–LIV. RUBIACEAE ANJUM PERVEEN AND MUHAMMAD QAISER Abstract: Pollen morphology of 50 species representing 20 genera of the family Rubiaceae from Pakistan has been examined by light and scanning electron microscope. Pollen grains usually radially symmetrical, isopolar, mostly prolate-spheroidal to sub-prolate, often oblate-spheroidal -sub-oblate rarely prolate. Aperture colpate to pantocolpate, or 3-10-colporate, sexine thicker or thinner than nexine. Tectal surface mostly spinulose or scabrate–punctate, reticulate or rugulate -reticulate often psilate. On the basis of apertural types and exine ornamentation, 9 distinct pollen types are recognized viz., Argostemma sarmentosum-type, Aitchisonia rosea–type Galium elegans -type, Galium tenuissimum-type, Gaillonia macrantha-type, Jaubertia aucheri-type, Oldenlandia nudicaulis–type, Oldenlandia umbellata–type and Pseudogaillonia hymenostenphana-type Department of Botany, University of Karachi,Karachi - 75270, Pakistan |
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