J Syst Evol
• Research Articles •
Qing Gao1, Deborah S. Katz-Downie2, and Stephen R. Downie2
Angelica is a taxonomically
complex genus widespread throughout the North Temperate Zone. Previous
phylogenetic studies of the genus have focused primarily on its East Asian
species. The relationships among its North American members, the monophyly of
these species, and the value of fruit morphology in circumscribing its taxa
have yet to be examined. This study represents the most comprehensive sampling
of Angelica to date (100 species) and
includes all 26 species in North America. Relationships are inferred using
Bayesian inference, maximum likelihood, and maximum parsimony analyses of ITS
sequences and, for multiple accessions of each North American species, cpDNA ndhF-rpl32, rpl32-trnL, and psbM-psbD sequences. The fruit morphological characters examined were those considered phylogenetically
important in East Asian Angelica. The
results revealed the North American species fell into three major clades: North
American Angelica clade, Archangelica clade, and the Eurasian Angelica clade. Angelica dawsonii has affinities with Lomatium brandegeei.
Fourteen species within the North American Angelica clade were strongly supported as monophyletic. Two paraphyletic species
resulted in new combinations in A.
lineariloba and A. venenosa.
Conflict between the ITS- and cpDNA-derived phylogenies and the lack of
resolution in portions of the trees may be due to chloroplast capture and rapid
species radiation. Fruit morphology supported some interspecific relationships
based on molecular data, and relationships revealed by ITS and cpDNA data were
roughly in accordance with fruit classification type and geographic
distribution region, respectively. A diagnostic key based on fruit morphology
is provided for the identification of the North American Angelica taxa.
Chenyang Liao, Qing Gao, Deborah S. Katz-Downie, and Stephen R. Downie. A
systematic study of North American Angelica species (Apiaceae) based on
nrDNA ITS and cpDNA sequences and fruit morphology[J]. J Syst Evol, DOI: 10.1111/jse.12702.
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