9.
Phylogenetic relationships of the three genera of the family Altingiaceae, i.e.,
Altingia,
Liquidambar and
Semiliquidambar, based on
matK sequences and the intergenic spacer between the
psaA and
ycf3 genes (PY-IGS) of cpDNA, and on the internal transcribed spacer (ITS) of nrDNA were studied. Phylogenetic trees based on
the three data sets (
matK, PY-IGS and ITS) were generated using
Hamamelis japonica and
Mytilaria laosensis (Hamamelidaceae),
Cercidiphyllum japonicum (Cercidiphyllaceae), and
Daphniphyllum calycinum (Daphniphyllaceae) as outgroups. The partition-homogeneity tests indicated that the three data sets and the combined data
are homogeneous. A combined analysis also generated a strongly supported phylogeny. The phylogenetic trees show that the North
American and western Asian species,
L. styraciflua and
L. orientalis, respectively, form a monophyletic group which is sister to the clade including all Asian species in the family. The genus
Liquidambar is paraphyletic with
Altingia and
Semiliquidambar nested within. Phylogenetic analyses of the molecular data indicate that taxonomic reexamination of the generic delimitation
in the Altingiaceae is needed.
Received December 20, 2000 Accepted June 25, 2001
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