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Asian Journal of Plant Sciences
Year: 2002  |  Volume: 1  |  Issue: 2  |  Page No.: 182 - 187

Palynological Study of the Genus Crepis from Pakistan

Sohail Jamil Qureshi, Abdul Ghani Awan, Mir Ajab Khan and Sofia Bano    

Abstract: Pollen morphology of four different species, Crepis flexuosa, Crepis multicaulis, Crepis sancta and Crepis thomsonii, belonging to genus Crepis of family Asteraceae were studied from Pakistan. Morphology of pollen grains of each of the species is based on 20 specimens selected at random. Proposed characters i.e., grain, shape of pollen grain, equatorial view, polar view, equatorial diameter (E), polar diameter (P), P / E ratio, length of colpus, exine surface, exine thickness, inter poral distance, inter spinal distance, inter spinal outline, length of spines and number of spines between colpi in each species were recorded for comparison. At species level, micromorphological differences and distribution of surface pattern, shape and size of pollen have been found to exist. The pollen grains are consistently echinate and trizonocolporate. Maximum equatorial diameter, polar diameter and colpus length was observed in Crepis multicaulis while in Crepis flexuosa spine length and exine thickness is found top be maximum. Inter poral distance is minimum in Crepis flexuosa. Inter spinal distance & P/E ratio is higher in Crepis thomsonii. This study demonstrates the potential of pollen studies in distinguishing some taxonomic groups in the Asteraceae.

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