A palynological study of the flora of Karachi [Pakistan]
1991
Qaiser, M. | Parveen, A.
Pollen morphology of 360 species, from Karachi belonging to 67 families, distributed in 58 dicots and 10 monocots, have been examined by Light and Scanning Electron Microscopy. Pollen morphology of these families is extremely varied in size, shape, polarity, structure, number and position of apertures and exine ornamentation. The size of pollen ranges from smallest (Zygophyllum simplex 9.7 x 9.8 m) to largest (Senera incana, 100, 2 x 111 m). The grains are commonly prolate spheroidal to oblate spheroidal, sometimes prolate to subprolate. The apertures are generally colporate, colporate or porate rarely nonaperturate. In some families like Boraginaceae and Acanthaceae more distinct heterocolporate grains are also observed. Besides this some miscellaneous type of apertures have also been found in Neuradaceae, Sapindaceae and Menyanthaceae (Wymphioides cirstate). Tectum of the grains is extremely varied, i.e. Psilate, subpsilate, reticulate regulate, foveolate, scabrate, striated, echinate and tubuliferous spinulose. In addition to this some families are remarkably distinct in their pollen types Acanthaceae, Boraginaceae, Convolvulaceae, Polygonaceae, Typhaceae and Zygophyllaceae.
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