New Zealand Journal of Botany abstracts
Patterns of diversification in Chionohebe and Parahebe
(Scrophulariaceae) inferred from ITS sequences
STEVEN J. WAGSTAFF
Landcare Research
P.O. Box 69
Lincoln, New Zealand
PHILIP J. GARNOCK-JONES
School of Biological Sciences and Island Biology Research Programme
Victoria University of Wellington
P.O. Box 600
Wellington, New Zealand
Abstract Phylogenetic relationships of
Chionohebe and
Parahebe were inferred from analysis of ITS sequences. The results
suggest that the genus
Parahebe is polyphyletic as currently
circumscribed, and the genus
Chionohebe may be paraphyletic by exclusion
of some of the alpine
Parahebe.
Parahebe lithophila emerges with
the Australian endemics
Derwentia and
Hebe formosa. The
alpine species of
Parahebe emerge with
Chionohebe,
Hebe
cheesemanii, and
H.
cupressoides.
Parahebe Groups A
and B of Ashwin emerge with
Hebe and
Heliohebe. The origin of the
New Zealand taxa is equivocal.
Chionohebe densifolia,
C.
ciliolata, and
Parahebe vandewateri have New Zealand
ancestry and have subsequently dispersed to Australia and New Guinea. The
mountains of New Zealand are an important centre of diversification, and it
appears that evolution in the group has been rapid. Autogamy has independently
evolved in at least two lineages and may be an adaptation to alpine
environments.
Keywords alpine; Australia; Chionohebe; Hebe
complex; ITS sequences; mountains; New Guinea; New Zealand; Parahebe;
phylogeny; rDNA; Scrophulariaceae
B99031
Received 2 July 1999; accepted 14 February 2000
PDF file of entire paper: medium quality (1273K); (scanned from paper original: notes about this process)
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