Register      Login
Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

The occurrence of unisexuality and polyploidy in Isotoma fluviatilis

JA Mccomb

Australian Journal of Botany 16(3) 525 - 537
Published: 1968

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.

https://doi.org/10.1071/BT9680525

© CSIRO 1968

Committee on Publication Ethics


Export Citation Get Permission

View Dimensions