New Zealand Journal of Botany abstracts
Relationships of the New Zealand mountain ribbonwoods (Hoheria
glabrata and H. lyallii: Malvaceae), based on
molecular and morphological data
P. B. Heenan
M. I. Dawson
D. N. Redmond
S. J. Wagstaff
Allan Herbarium
Landcare Research
P.O. Box 69
Lincoln, New Zealand
Abstract Cluster and principal coordinates
analyses of leaf morphological data support the recognition of Hoheria
glabrata and H. lyallii at species rank. H. glabrata
is distinguished by long leaves with distinctly cordate bases, sparsely
hairy surfaces, shallow marginal indentations, and an acuminate apex.
This species occurs in western parts of the South Island and in
Taranaki in the North Island. In contrast, the leaves of H. lyallii
are shorter, have truncate bases, moderately to densely hairy surfaces,
and an acute apex. H. lyallii has a more restricted
distribution, mainly occurring in Canterbury and Marlborough with a
disjunct population in Nelson. A new combination, H. ×allanii,
is provided for the interspecific hybrid H. angustifolia
× H. lyallii. Phylogenetic analyses of ITS and trnK/matK
sequence data provided strong support for the recognition of the genus Hoheria,
but supported conflicting species groups. The trnK/matK
analysis recovered two main clades. One clade comprised all samples of H.
glabrata and most samples of H. lyallii, and the other
clade included three samples of H. lyallii and all of the other
species of Hoheria (H. angustifolia, H. equitum,
H. ovata, H. populnea, and H. sexstylosa). Two
analyses of the ITS data were undertaken and these provided little
indication of species relationships in Hoheria. However, an ITS
analysis that excluded H. glabrata and H. lyallii
samples with heterogenic nucleotide sites recovered a well-supported
clade that included all specimens of H. glabrata and a weakly
supported clade that comprised most of the specimens of H. lyallii.
The conflicting signal from the trnK/matK and ITS sequences provides
evidence of hybridisation between different species of Hoheria.
Four samples in the ITS data had heterogenic nucleotide positions and
in the trnK/matK data three of the H. lyallii
specimens had the chloroplast haplotype of another species of Hoheria
Keywords Malvaceae; Hoheria; H.
glabrata; H. lyallii; taxonomy; DNA; ITS; trnK/matK;
phylogeny; New Zealand flora
B04048; Received 29 November 2004; accepted 14 March 2005; Online
publication date 28 June 2005
New Zealand Journal of Botany, 2005, Vol. 43: 527–549
0028–825X/05/4302–0527 © The Royal Society of New Zealand 2005
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