Pak. J. Bot., 38(3): 511-520, 2006. | Back to Contents | ||||
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Updated: 09-07-09 | ||||
PALYNOLOGICAL OBSERVATIONS ON THE GENUS CALENDULA (CALENDULEAE-COMPOSITAE) FROM PAKISTAN AKBAR ALI MEO AND MIR AJAB KHAN* Abstract: The pollen morphology of Calendula species was investigated
by light and scanning electron microscopy. Pollen grains are prolate-spheroidal
in equatorial view and semi-angular in polar view, tri. to tetrazoncolporate,
caveate and echinate. Size of polar axis and equatorial diameter, exine
thickness, spine length are presented. Variation exists at species level
i.e. exine thickness is higher in C.arvensis L. (6.3 µm)
as compared to C.officinalis L. (3.3 µm). Existence of
simple and closely placed pair of spines are highly diagnostic in Calendula.
In C. officinalis spines are mostly paired and in C. arvensis
mostly simple but closely placed pairs of spines also exist. Department of Biology, Government College, Satellite Town, Rawalpindi, Pakistan. * Department of Biological Sciences, Quaid-I-Azam University, Islamabad Pakistan. |
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