A Palyological- Taxonomic Study of the: Genus Asystmlia and A Palynological S'rully of Some related Genera in the Acanthaceae
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Date
1982-06
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Addis Ababa University
Abstract
The pollen morphology of nineteen species of Acanthaceael
nine of AsystaEia and ten of five other genera have been
investigated using light and/or electron microscopes. The
five genera Graptophyllum, Jacobinia, Just;'cia, Hacka~ and
styll~~ can be separated from each other by the number and
character of apertures, exine stratification and/or by the nature
of the "trema area". l'he study has revealed that the pollen grains
of the genus Asystasia are three-porate and the surfaces are provided
with nine colpoid streaks. The sexine is smooth. The
species can be. separated from each other by the difference in the
prominence of the colpoid streaks and by the nature of the sexinuous
region around the pore.
A detailed study of the pan-tl'opical species Ii. gangetica
(L.) T. Anders. has resulted in its subdivision into two geographical
subspecies on the basis of corolla and style and stigma
lengths. It is also supported by pollen size and seed morphology.
The subspecies with long corolla and style and stigma is designated
as subsp. gangetica and the one with short corolla and style and
stigma subsp. micrantha. The distribution of both taxa is
illustrated.
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Biology