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ndltd-OhioLink-oai-etd.ohiolink.edu-osu12610552962021-08-03T05:57:50Z Systematics of Trichostema L. (Lamiaceae) and phylogenetic relationships with its disjunct taxa in Asia Huang, Mingjuan <p>The so-called <i>Caryopteris-Trichostema</i> complex (Lamiaceae) consists of these two genera and several monotypic or very small genera. <i>Trichostema</i> is North American whereas all other taxa are Asiatic. Parsimony analyses of morphology and sequences from the nuclear ribosomal DNA internal transcribed spacer region (ITS) and the chloroplast DNA <i>ndhF</i> gene were performed to assess the sectional relationships within <i>Trichostema</i>. A cladistic analysis of the complex was carried out using <i>ndhF</i> sequences to reconstruct phylogenetic relationships of <i>Trichostema</i> with its related taxa in Asia. The monophyly of <i>Trichostema</i> is strongly supported in all analyses except for the morphological phylogeny. Two well-supported monophyletic sections, i.e., <i>Chromocephalum</i> and <i>Trichostema</i>, appear in all analyses. Three combinations of morphological and molecular data (ITS, <i>ndhF</i>, ITS plus <i>ndhF</i>) suggest that section <i>Chromocephalum</i> is sister to the rest of <i>Trichostema</i>, and sections <i>Orthopodium</i> and <i>Paniculatum</i> are monophyletic. Although the molecular data alone suggest that <i>Trichostema brachiatum</i> is not a member of section <i>Orthopodium</i>, morphology and all analyses of the combined morphological and molecular data suggest that <i>T. brachiatum</i> is sister to the rest of section <i>Orthopodium</i>. The <i>ndhF</i> phylogeny of the <i>Caryopteris-Trichostema</i> complex suggests that <i>Caryopteris</i> s.l.ii is polyphyletic; <i>Caryopteris</i> s. str., <i>Pseudocaryopteris</i>, <i>Schnabelia</i>, and <i>Trichostema</i> are strongly supported as monophyletic. <i>Tripora divaricata</i>, the sole member of the genus and characterized by its porate pollen, is sister to <i>Pseudocaryopteris</i> in a moderately supported clade. <i>Rubiteucris</i> is well supported as sister to <i>Schnabelia</i>. The <i>ndhF</i> analysis provides strong evidence to support the transfer of <i>S. nepetifolia</i> and <i>S. terniflora</i> from <i>Caryopteris</i> to <i>Schnabelia</i> by <i>Cantino</i> et al. Although the <i>ndhF</i> data suggest that the sister group of <i>Trichostema</i> is <i>Caryopteris</i>, with <i>Amethystea</i> the next most closely related taxon, the analyses that combined ITS and <i>ndhF</i> data with morphological data suggest that the sister group of <i>Trichostema</i> is <i>Amethystea</i>, a clade comprising <i>Amethystea</i> and <i>Caryopteris</i>, or a clade comprising <i>Amethystea</i> and <i>Teucrium</i>. The evolution of gynoecial morphology and the biogeographic history of the <i>Caryopteris-Trichostema</i> complex are discussed from a phylogenetic perspective.</p> 2002 English text The Ohio State University / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=osu1261055296 http://rave.ohiolink.edu/etdc/view?acc_num=osu1261055296 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
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NDLTD
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| language |
English
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NDLTD
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| author |
Huang, Mingjuan
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| spellingShingle |
Huang, Mingjuan
Systematics of Trichostema L. (Lamiaceae) and phylogenetic relationships with its disjunct taxa in Asia
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| author_facet |
Huang, Mingjuan
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| author_sort |
Huang, Mingjuan
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| title |
Systematics of Trichostema L. (Lamiaceae) and phylogenetic relationships with its disjunct taxa in Asia
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| title_short |
Systematics of Trichostema L. (Lamiaceae) and phylogenetic relationships with its disjunct taxa in Asia
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| title_full |
Systematics of Trichostema L. (Lamiaceae) and phylogenetic relationships with its disjunct taxa in Asia
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| title_fullStr |
Systematics of Trichostema L. (Lamiaceae) and phylogenetic relationships with its disjunct taxa in Asia
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| title_full_unstemmed |
Systematics of Trichostema L. (Lamiaceae) and phylogenetic relationships with its disjunct taxa in Asia
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| title_sort |
systematics of trichostema l. (lamiaceae) and phylogenetic relationships with its disjunct taxa in asia
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| publisher |
The Ohio State University / OhioLINK
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| publishDate |
2002
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| url |
http://rave.ohiolink.edu/etdc/view?acc_num=osu1261055296
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| work_keys_str_mv |
AT huangmingjuan systematicsoftrichostemallamiaceaeandphylogeneticrelationshipswithitsdisjuncttaxainasia
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| _version_ |
1719428518736035840
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