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Taxonomy of ranunculus in Tasmania

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Menadue, Y(Yvonne) (1986) Taxonomy of ranunculus in Tasmania. PhD thesis, University of Tasmania.

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Abstract

A taxonomic treatment has been made of Ranunculus in
Tasmania. Mainland species have been included in some
aspects of the work especially where they have particular
bearing on the Tasmanian species.
The approach was multifaceted and included traditional
taxonomic methods of examination and description, and
experimental investigations.
Three new species have been described. Two species,
R. decurvus and R. concinnus showed such close morphological
similarity that multivariate morphometric analyses were
employed to try to separate them. These analyses,
principal components analysis, discriminant function
analysis and a clustering technique, resulted in
R. concinnus being considered a synonym under R. decurvus.
An updated key for Tasmanian Ranunculus has been produced.
Chromosome counts were made of 35 species.
Intraspecific polyploid complexes were shown to occur in two
native species, R. glabrifolius and R. amphitrichus.
Transplant and controlled-environment growth
experiments were conducted to investigate the polymorphism
in R. nanus. Aspects of variation examined included leaf
area, dentateness, petiole length and hairiness. These
characters were shown to be phenotypically plastic.
Different fixed genotypes of R. nanus occur in different
habitats.
A preliminary survey of the occurence of flavonoids was
conducted. This line of research shows great potential as
a method of elucidating the relationships between the
species. One compound was identified as rutin and three
other compounds were partially identified.
'Recent' evolution is indicated for many of the species
and the processes of speciation are apparent. The alpine
species show a high level of endemism. Inter-continental
relationships are few. This study concludes with some
general comments on the possible causes and evidence for
these statements.

Item Type: Thesis (PhD)
Keywords: Ranunculus, Ranunculus, Flowers
Copyright Holders: The Author
Copyright Information:

Copyright 1986 the Author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s).

Additional Information:

Thesis (Ph.D.)--University of Tasmania, 1987. Bibliography: leaves 212-219. Spine title: Taxonomy of genus Ranunculus in Tasmania

Date Deposited: 19 Dec 2014 02:28
Last Modified: 05 Oct 2017 03:59
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