A Palyological- Taxonomic Study Of The Genus Asystmlia And A Palynological Srully Of Some Related Genera In The Acanthaceae

The pollen morphology of nineteen species of Acanthaceaelrnnine of AsystaEia and ten of five other genera have beenrninvestigated using light and/or electron microscopes. Thernfive genera Graptophyllum, Jacobinia, Just;'cia, Hacka~ andrnstyll~~ can be separated from each other by the number andrncharacter of apertures, exine stratification and/or by the naturernof the "trema area". l'he study has revealed that the pollen grainsrnof the genus Asystasia are three-porate and the surfaces are providedrnwith nine colpoid streaks. The sexine is smooth. Thernspecies can be. separated from each other by the difference in thernprominence of the colpoid streaks and by the nature of the sexinuousrnregion around the pore.rnA detailed study of the pan-tl'opical species Ii. gangeticarn(L.) T. Anders. has resulted in its subdivision into two geographicalrnsubspecies on the basis of corolla and style and stigmarnlengths. It is also supported by pollen size and seed morphology.rnThe subspecies with long corolla and style and stigma is designatedrnas subsp. gangetica and the one with short corolla and style andrnrnstigma subsp. micrantha. The distribution of both taxa isrnillustrated.

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