New Zealand Journal of Botany abstract
B97029
Received 6 June 1997; accepted 18 December 1997
Phylogenetic relationships of species of Gingidia and related genera
(Apiaceae, subfamily Apioideae)
A. D. MITCHELL
Landcare Research
P. O. Box 69
Lincoln, New Zealand
C. J. WEBB
Foundation for Research, Science and Technology
P. O. Box 12-240
Wellington, New Zealand
S. J. WAGSTAFF
Landcare Research
P. O. Box 69
Lincoln, New Zealand
Abstract Five genera of Australasian apioid Apiaceae
(
Gingidia,
Scandia,
Lignocarpa,
Anisotome, and
Aciphylla) have a complex taxonomic history with the circumscription of,
and inferred relationships among, the currently accepted genera based on only
morphological characters. This molecular and phylogenetic study focuses on the
relationships among the taxa currently included within
Gingidia using
the other genera as outgroups. Phylogenetic analyses of nuclear ribosomal DNA
internal transcribed spacer region sequences for 17 species from these genera,
and comparison with
Smyrnium to root the trees, indicate that
Gingidia is polyphyletic as currently circumscribed, the species
belonging in two distinct monophyletic groups. However, morphological
characters do not support these two groups, making taxonomic interpretation
difficult. The monophyletic
G. montana group includes the ditypic
endemic genera
Scandia and
Lignocarpa, suggesting that they
should not be maintained. The second monophyletic group includes
G.
decipiens and
G. flabellata with species of
Anisotome.
Although our sampling of
Anisotome and
Aciphylla is limited,
nothing in the analysis of the molecular data is inconsistent with earlier
suggestions, based on morphological data, that
Gingidia,
Scandia,
Lignocarpa,
Anisotome, and
Aciphylla form a monophyletic
group.
Keywords Aciphylla; Anisotome; Gingidia;
Lignocarpa; Scandia; Apiaceae; Internal Transcribed Spacer (ITS);
maximum likelihood analysis; morphology; parsimony analysis; phylogenetic
relationship; rDNA sequence data
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