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PJB-1987-12
Palynological study of onosma (boraginaceae ) from pakistan
Abstract
Pollen morphology of 9 species of the genus onosma from Pakistan was studied . the genus is characterized by 3-colporate pollen grains with sub-prolate to sub- oblate shape; ovate , circular and obtate equatorial outlines. The endoapertures in six species are offset from the equator whereas in 3 species endoapertures are at the equator . the tectum is echinate and granculated with perforations (puncta). The taxonomic position of the genus is discussed in the lght of pollen morphology.
