A Palynological- Taxonomic Study Of The Genus Asystasia And A Plynological Study Of Some Related Genera.. In The Acanthaceae

The pollen morphology of ni neteen s pec i es of Acanthaceae :rnnine of A5ystneia and ten of five other genera ha ve beenrninves tigated usinG l i ght and/or electron mic roscope s . Thernfive gener a Gr a p tophyllurn , Jacobini a, Jus t i c i a , Mackays andrn~~~ cun be sepa r ated fr om each other by the number andrncharacte r of a pertur es , exine st r at ifi cat i on and/or by the natur ernof the " trem" a r ea". The study has r evealed tha t the pollen gr ainsrnof the ge nus H6yst ns i a a r e th r ee - pora te and the surfa ces a r e provirnded with nine colpoid streaks . The sexine i s smooth. Thernspec i es can be separ ated from each other by the di ffe rence i n thernpr omine nce of the colpoi d s treaks and by the nature of t he sexi nUQuernregion a r ound the por e .rnA detailed study of the pa n- t r opi c al spec i es ~ . gangeticarn(L . ) T. hnders . has r esulted in its s ubdivis i on into two geogrrnaphic a l s ubspec i es on the basi s of corolla and s tyle and s t i gmarnl engths . It i s also s uppor ted by poll en s i ze and seed morphol ogy .rnThe subspec i es with long coroll a a nd s tyle and s tigma i s desi gna t edrnas subs p . gpnget ica and the one with shor t corol la and style andrnsti gma 6ubsp . mic r antha . The distribution of both taxa i srni llustr ated .

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