Abstract
In northern New South Wales Isotoma fluviatilis is diploid and hermaphrodite;
in southern New South Wales, Victoria, South Australia, and Tasmania it is tetraploid
and hermaphrodite; on the coastal plain to the west and north of Sydney it is diploid
and dioecious; and near Rylstone (N.S.W.) there occurs one gynodioecious population.
The morphology of the different forms is described, and the possibility is discussed
that unisexuality and polyploidy in I. Fluviatilis represent alternative mechanisms by which
hybridity has been increased in inbreeding marginal populations of diploid hermaphrodites,
and that these two mechanisms have been associated with the elaboration of
genetic constitutions enabling new territory to be invaded.
Subject
Plant Science,Ecology, Evolution, Behavior and Systematics
Cited by
16 articles.
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