Tarennella, a new Pavetteae (Rubiaceae) genus from eastern Madagascar
Background – This contribution is part of an ongoing study on the taxonomy and the phylogenetic relationships of the Malagasy representatives of the tribe Pavetteae (Rubiaceae).Material and methods – Taxonomic methods follow normal practice of herbarium taxonomy. A molecular study using the plastid...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Meise Botanic Garden
2021-03-01
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| Series: | Plant Ecology and Evolution |
| Subjects: | |
| Online Access: | https://plecevo.eu/article/24528/download/pdf/ |
| _version_ | 1797421874620137472 |
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| author | Petra De Block Franck Rakotonasolo Sylvain G. Razafimandimbison Aaron P. Davis Steven B. Janssens |
| author_facet | Petra De Block Franck Rakotonasolo Sylvain G. Razafimandimbison Aaron P. Davis Steven B. Janssens |
| author_sort | Petra De Block |
| collection | DOAJ |
| description | Background – This contribution is part of an ongoing study on the taxonomy and the phylogenetic relationships of the Malagasy representatives of the tribe Pavetteae (Rubiaceae).Material and methods – Taxonomic methods follow normal practice of herbarium taxonomy. A molecular study using the plastid markers rps16, trnT-F, petD, and accD-psa1, the nuclear ribosomal marker ITS and the nuclear MADS-box gene marker PI was executed.Key results – Five new species are described from littoral, lowland, or mid-elevation humid forests in eastern Madagascar. They are characterized by compact inflorescences with small, sessile flowers, a densely pubescent style, large placentas with 2–3 immersed ovules, seeds with a small, superficial hilum not surrounded by a thickened annulus, and pollen grains with supratectal elements. The phylogenetic tree, which included three of the five new species, showed an unresolved backbone but high support for distal nodes grouping species. The new species form a distinct monophyletic clade among the other Malagasy Pavetteae genera and are recognised at genus level under the name Tarennella. Provisional IUCN Red List assessments show that Tarennella homolleana is Vulnerable, T. cordatifolia and T. sanguinea are Endangered, T. puberula is Critically Endangered, and T. coronata is Critically Endangered (Possibly Extinct). |
| first_indexed | 2024-03-09T07:23:41Z |
| format | Article |
| id | doaj.art-29d0e18055984f068cb76f5235289565 |
| institution | Directory Open Access Journal |
| issn | 2032-3921 |
| language | English |
| last_indexed | 2024-03-09T07:23:41Z |
| publishDate | 2021-03-01 |
| publisher | Meise Botanic Garden |
| record_format | Article |
| series | Plant Ecology and Evolution |
| spelling | doaj.art-29d0e18055984f068cb76f52352895652023-12-03T07:10:10ZengMeise Botanic GardenPlant Ecology and Evolution2032-39212021-03-0115418711010.5091/plecevo.2021.175624528Tarennella, a new Pavetteae (Rubiaceae) genus from eastern MadagascarPetra De Block0Franck Rakotonasolo1Sylvain G. Razafimandimbison2Aaron P. Davis3Steven B. Janssens4Meise Botanic Garden, Nieuwelaan 38, BE-1860 MeiseParc Botanique et Zoologique de TsimbazazaSwedish Museum of Natural History, Department of Botany, Box 50007Royal Botanic Gardens, KewMeise Botanic Garden, Nieuwelaan 38Background – This contribution is part of an ongoing study on the taxonomy and the phylogenetic relationships of the Malagasy representatives of the tribe Pavetteae (Rubiaceae).Material and methods – Taxonomic methods follow normal practice of herbarium taxonomy. A molecular study using the plastid markers rps16, trnT-F, petD, and accD-psa1, the nuclear ribosomal marker ITS and the nuclear MADS-box gene marker PI was executed.Key results – Five new species are described from littoral, lowland, or mid-elevation humid forests in eastern Madagascar. They are characterized by compact inflorescences with small, sessile flowers, a densely pubescent style, large placentas with 2–3 immersed ovules, seeds with a small, superficial hilum not surrounded by a thickened annulus, and pollen grains with supratectal elements. The phylogenetic tree, which included three of the five new species, showed an unresolved backbone but high support for distal nodes grouping species. The new species form a distinct monophyletic clade among the other Malagasy Pavetteae genera and are recognised at genus level under the name Tarennella. Provisional IUCN Red List assessments show that Tarennella homolleana is Vulnerable, T. cordatifolia and T. sanguinea are Endangered, T. puberula is Critically Endangered, and T. coronata is Critically Endangered (Possibly Extinct).https://plecevo.eu/article/24528/download/pdf/endemismhumid forestPavetteaephylogenetic an |
| spellingShingle | Petra De Block Franck Rakotonasolo Sylvain G. Razafimandimbison Aaron P. Davis Steven B. Janssens Tarennella, a new Pavetteae (Rubiaceae) genus from eastern Madagascar Plant Ecology and Evolution endemism humid forest Pavetteae phylogenetic an |
| title | Tarennella, a new Pavetteae (Rubiaceae) genus from eastern Madagascar |
| title_full | Tarennella, a new Pavetteae (Rubiaceae) genus from eastern Madagascar |
| title_fullStr | Tarennella, a new Pavetteae (Rubiaceae) genus from eastern Madagascar |
| title_full_unstemmed | Tarennella, a new Pavetteae (Rubiaceae) genus from eastern Madagascar |
| title_short | Tarennella, a new Pavetteae (Rubiaceae) genus from eastern Madagascar |
| title_sort | tarennella a new pavetteae rubiaceae genus from eastern madagascar |
| topic | endemism humid forest Pavetteae phylogenetic an |
| url | https://plecevo.eu/article/24528/download/pdf/ |
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