The present study comprises pollen morphology and viability estimation that may be utilized as an aid for the
taxonomic description of 7 species of family Asteraceae. The species chosen are Chromolaena odorata (L.) R.M.king & H.Rob.,
Cosmos sulphureus Cav., Cyanthillium cinereum (L.) H.Rob., Pulicaria vulgaris Gaetrn., Tagetes erecta L., Tithonia diversifolia
(Hemsl.) A.Gray., Tridax procumbens L. Pollen grains were properly collected and used for analysis. Normally, the pollens are
tricolporate, echinate and spheroidal. The amount of aperture of these species analyzed ranged from 3 to 4 while the pollen wall
normally varied from smooth to spinate. Amongst the seven species colporous aperture kind was found in Cosmos,
Cyanthillium, Tagetes, Tithonia, and Tridax; whereas porate type in chromolaena. The shape of pollen is diverse from oblatespheroidal to prolate spheroidal. The pollen viability rate ranges from 65 - 86%, which proves that the pollen flora of chosen
species is well established.
