| 1. |
- De Block, Petra, et al.
(författare)
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Molecular phylogenetics and generic assessment in the tribe Pavetteae (Rubiaceae)
- 2015
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Ingår i: Taxon. - : Wiley. - 0040-0262 .- 1996-8175. ; 64:1, s. 79-95
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Tidskriftsartikel (refereegranskat)abstract
- This is the first phylogenetic study focused on the Pavetteae, one of the most species-rich and morphologically diverse tribes within the coffee family (Rubiaceae). Fifteen of the 17 currently recognized genera, represented by 85 taxa, were sequenced for rps16, trnT-F and ITS and analysed using Bayesian inference and maximum likelihood methods. The monophyly of the Pavetteae is confirmed. Four major lineages are identified, but their phylogenetic relationships are not fully resolved. The continental African genera Rutidea, Nichallea and Tennantia, the Madagascan genera Homollea and Robbrechtia, and the paleotropical genus Pavetta are monophyletic. Other genera are paraphyletic in their current circumscriptions and the following changes are made: Homolliella is placed in synonymy with Paracephaelis, and Coleactina and Dictyandra with Leptactina, resulting in four new combinations. The large paleotropical genus Tarenna is shown not to be monophyletic. In the future, the name Tarenna should not be used for continental African species. Most of these could be transferred to the hitherto monospecific genus Cladoceras, but other species might constitute altogether new genera. The relationship between the monophyletic Asian-Pacific and Madagascan Tarenna species remains unclear. The phylogeny of the Madagascan genera of the Pavetteae is largely unresolved and the largest Madagascar-centred genus Coptosperma was not recovered as monophyletic. The low resolution for the Madagascan taxa can be considered as an indication of rapid radiation. Further molecular and morphological studies are necessary to clarify the phylogeny of the Pavetteae, especially regarding the African Tarenna species and the Madagascan genera of the tribe.
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| 2. |
- De Block, Petra, et al.
(författare)
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Tarennella, a new Pavetteae (Rubiaceae) genus from eastern Madagascar
- 2021
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Ingår i: Plant Ecology and Evolution. - : Agentschap Plantentuin Meise. - 2032-3913 .- 2032-3921. ; 154:1, s. 87-110
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Tidskriftsartikel (refereegranskat)abstract
- 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).
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| 3. |
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| 4. |
- De Block, Petra, et al.
(författare)
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The Vanguerieae alliance (subfamily Ixoroideae)
- 2022
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Ingår i: The new Natural History of Madagascar. - USA : Princeton University Press. ; , s. 762-764
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 5. |
- Kainulainen, Kent, et al.
(författare)
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The Coffeeae alliance (subfamily Ixoroideae)
- 2022
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Ingår i: The new Natural History of Madagascar. - USA : Princeton University Press. ; , s. 759-761
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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| 6. |
- Mouly, Arnaud, et al.
(författare)
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A new species of Coptosperma (Rubiaceae) from the Comoro Islands and Madagascar
- 2008
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Ingår i: Systematics and Geography of Plants. - 1374-7886. ; 78, s. 145-154
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Tidskriftsartikel (refereegranskat)abstract
- In the Comoro Islands, Rubiaceae are one of the largest families of flowering plants, represented by c. twenty genera and seventy species. Among these genera, Coptosperma (Pavetteae, Ixoroideae) is represented by two widely distributed species, also occurring in Madagascar andcontinental Africa, and a third species new to science. Coptosperma mitochondrioides Mouly & De Block possesses large stipules of the “bec de canard” type and ribbed fruits. While this type of stipule is typical for many Malagasy Coptosperma species, ribbed fruits are very rare within the genus. Within the Comoros archipelago C. mitochondrioides is restricted to Mayotte, but the species is also known from northern Madagascar. The new species is described and illustrated and a key to the species of Coptosperma occurring in the Comoros is provided.
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| 7. |
- Padayachy, Tarah, et al.
(författare)
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Phylogeny and taxonomic revision of the genus Craterispermum (Rubiaceae) in the Seychelles Archipelago
- 2020
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Ingår i: Phytotaxa. ; 4, s. 261-276
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Tidskriftsartikel (refereegranskat)abstract
- The genus Craterispermum (Craterispermeae, Rubiaceae) is distributed in the tropical rain forests of Africa and Madagascar, with one morphologically variable species (Craterispermum microdon ) hitherto recognized in the Seychelles Archipelago. We conducted a Bayesian analysis of the combined ETS and ITS sequence data to: 1) test the monophyly of the Seychellois species of Craterispermum ; and 2) assess the phylogenetic relationships between the island populations. Our analyses supported the monophyly and, therefore, the single Malagasy origin of the Seychellois Craterispermum . The phylogenetic relationships between the three island populations were unresolved, since the Seychellois plants display a very low level of molecular variation. However, both herbarium and field studies revealed that the Craterispermum taxa occurring on the islands of Mahé, Praslin, and Silhouette, are morphologically distinct and geographically separated. As a result of these studies, two new species, Craterispermum praslinense and C. silhouettense , are described, to accommodate the Praslin and Silhouette populations, respectively, and C. microdon is restricted to the population on Mahé Island. A new taxonomic account for the Seychellois Craterispermum , and an identification key to the three species present in the archipelago, are provided. A provisional conservation status of each species, according to the IUCN Categories and Criteria, is presented.
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| 8. |
- Razafimandimbison, Sylvain, 1964-, et al.
(författare)
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Rubiaceae of Madagascar: progress since 2003
- 2022
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Ingår i: The new Natural History of Madagascar. - USA : Princeton University Press. ; , s. 744-752
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Bokkapitel (övrigt vetenskapligt/konstnärligt)
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