2018
Hanáček, Pavel; Bruyns, Peter V
A New Species of Ceropegia Sect. Rhytidocaulon (Apocynaceae) from Southern Yemen Artikel
In: Haseltonia, Bd. 2018, Nr. 24, S. 51 – 54, 2018.
Abstract | Links | BibTeX | Schlagwörter: Arabian Peninsula, Ceropegieae, NE Africa, taxonomy
@article{10.2985/026.024.0108,
title = {A New Species of Ceropegia Sect. Rhytidocaulon (Apocynaceae) from Southern Yemen},
author = {Pavel Han\'{a}\v{c}ek and Peter V Bruyns},
url = {https://doi.org/10.2985/026.024.0108},
doi = {10.2985/026.024.0108},
year = {2018},
date = {2018-01-01},
journal = {Haseltonia},
volume = {2018},
number = {24},
pages = {51 -- 54},
publisher = {Cactus and Succulent Society of America},
abstract = {In this paper Ceropegia reflexa Hanacek, belonging to Ceropegia sect. Rhytidocaulon, is described. It is known from one locality in the Al Mahra Governorate of Yemen in the southern part of the Arabian Peninsula. This new species is characterized by long pedicels, reflexed corolla lobes and the unusual twisted cilia along the margins of the lobes. Ceropegia reflexa occurs together with C. fulleri in rocky parts of Jabal Fartak, but at lower altitudes and in less exposed places than C. fulleri. A key to the nine Arabian members of Ceropegia sect. Rhytidocaulon is provided.},
keywords = {Arabian Peninsula, Ceropegieae, NE Africa, taxonomy},
pubstate = {published},
tppubtype = {article}
}
In this paper Ceropegia reflexa Hanacek, belonging to Ceropegia sect. Rhytidocaulon, is described. It is known from one locality in the Al Mahra Governorate of Yemen in the southern part of the Arabian Peninsula. This new species is characterized by long pedicels, reflexed corolla lobes and the unusual twisted cilia along the margins of the lobes. Ceropegia reflexa occurs together with C. fulleri in rocky parts of Jabal Fartak, but at lower altitudes and in less exposed places than C. fulleri. A key to the nine Arabian members of Ceropegia sect. Rhytidocaulon is provided.
2017
Bruyns, P V; Klak, C; Hanáček, P
A revised, phylogenetically-based concept of Ceropegia (Apocynaceae) Artikel
In: South African Journal of Botany, Bd. 112, S. 399 – 436, 2017, ISSN: 0254-6299.
Abstract | Links | BibTeX | Schlagwörter: Ceropegieae, DNA-markers, Phylogeny, Stapeliads
@article{BRUYNS2017399,
title = {A revised, phylogenetically-based concept of Ceropegia (Apocynaceae)},
author = {P V Bruyns and C Klak and P Han\'{a}\v{c}ek},
url = {http://www.sciencedirect.com/science/article/pii/S0254629916339242},
doi = {https://doi.org/10.1016/j.sajb.2017.06.021},
issn = {0254-6299},
year = {2017},
date = {2017-01-01},
journal = {South African Journal of Botany},
volume = {112},
pages = {399 - 436},
abstract = {Recent phylogenetic reconstructions in the Ceropegieae (Apocynaceae-Asclepiadoideae) show that the 357 species of highly succulent stapeliads and four lineages of the 141 species of Brachystelma R.Br. ex Sims are nested within the 219 species of Ceropegia L. The stapeliads, shown convincingly to be nested within Ceropegia, are primarily characterized by their non-climbing, highly succulent, tuberculate stems with fleshy flowers with a mostly short corolla-tube. However, highly succulent, tuberculate stems are not restricted to the stapeliads and are present in four lineages of Ceropegia. Furthermore, tubular flowers are also found among the stapeliads and are not restricted to Ceropegia. Since a slender, tubular corolla is extremely homoplasious within Brachystelma, Ceropegia and the stapeliads, we move away from this as defining Ceropegia to recognize some sections in which there is a range from slender, tubular flowers to almost flat flowers. To re-establish a monophyletic Ceropegia, we propose a new classification in which Brachystelma and all genera of the stapeliads are placed in a greatly enlarged Ceropegia. This new concept of Ceropegia is defined by the lack of hard, wiry roots, the softly fleshy tissue of the peduncles and pedicels, the absence of any corolline corona, the presence of two well-developed series of the staminal corona and the presence of a compitum in the style-head leading to the fertilization of both ovaries. We transfer the species of Brachystelma into several sections of Ceropegia and reduce the 31 stapeliad genera to sections of Ceropegia, after which Ceropegia has 63 sections. Sect. Chamaesiphon H.Huber is the largest with 115 species, two sections among the stapeliads each contain over 50 species but the remaining sections are mostly considerably smaller. We provide diagnostic descriptions, lists of included species and distributions for each of the subdivisions that we recognise. Over 400 new combinations are made in Ceropegia.},
keywords = {Ceropegieae, DNA-markers, Phylogeny, Stapeliads},
pubstate = {published},
tppubtype = {article}
}
Recent phylogenetic reconstructions in the Ceropegieae (Apocynaceae-Asclepiadoideae) show that the 357 species of highly succulent stapeliads and four lineages of the 141 species of Brachystelma R.Br. ex Sims are nested within the 219 species of Ceropegia L. The stapeliads, shown convincingly to be nested within Ceropegia, are primarily characterized by their non-climbing, highly succulent, tuberculate stems with fleshy flowers with a mostly short corolla-tube. However, highly succulent, tuberculate stems are not restricted to the stapeliads and are present in four lineages of Ceropegia. Furthermore, tubular flowers are also found among the stapeliads and are not restricted to Ceropegia. Since a slender, tubular corolla is extremely homoplasious within Brachystelma, Ceropegia and the stapeliads, we move away from this as defining Ceropegia to recognize some sections in which there is a range from slender, tubular flowers to almost flat flowers. To re-establish a monophyletic Ceropegia, we propose a new classification in which Brachystelma and all genera of the stapeliads are placed in a greatly enlarged Ceropegia. This new concept of Ceropegia is defined by the lack of hard, wiry roots, the softly fleshy tissue of the peduncles and pedicels, the absence of any corolline corona, the presence of two well-developed series of the staminal corona and the presence of a compitum in the style-head leading to the fertilization of both ovaries. We transfer the species of Brachystelma into several sections of Ceropegia and reduce the 31 stapeliad genera to sections of Ceropegia, after which Ceropegia has 63 sections. Sect. Chamaesiphon H.Huber is the largest with 115 species, two sections among the stapeliads each contain over 50 species but the remaining sections are mostly considerably smaller. We provide diagnostic descriptions, lists of included species and distributions for each of the subdivisions that we recognise. Over 400 new combinations are made in Ceropegia.
2014
Bruyns, P V; Klak, C; Hanáček, P
In: Molecular Phylogenetics and Evolution, Bd. 77, S. 251 – 263, 2014, ISSN: 1055-7903.
Abstract | Links | BibTeX | Schlagwörter: Arabian Peninsula, Ceropegieae, DNA sequence data, Phylogeny, Rand Flora, Southern Africa
@article{BRUYNS2014251,
title = {Evolution of the stapeliads (Apocynaceae\textendashAsclepiadoideae) \textendash repeated major radiation across Africa in an Old World group},
author = {P V Bruyns and C Klak and P Han\'{a}\v{c}ek},
url = {http://www.sciencedirect.com/science/article/pii/S1055790314001225},
doi = {https://doi.org/10.1016/j.ympev.2014.03.022},
issn = {1055-7903},
year = {2014},
date = {2014-01-01},
journal = {Molecular Phylogenetics and Evolution},
volume = {77},
pages = {251 - 263},
abstract = {The stapeliads of the Ceropegieae (Apocynaceae\textendashAsclepiadoideae), are approximately 340 species of stem-succulents placed in around 30 genera, found in semi-arid parts of the Old World. Here we sampled 192 species (i.e. nearly two thirds of the total) from across the full geographic range of the group and analysed data from the two nuclear regions (nuclear ribosomal ITS and ncpGS) and five plastid regions (psbA-trnH intergenic spacer, rps16 intron, trnL\textendashtrnF intergenic spacer, trnS\textendashtrnG intergenic region and the non-coding rpl32-trnL region). We find that the stapeliads radiated first in the northern hemisphere from Africa to southern Europe and Myanmar. This radiation subtends a grade of minor clades in the south-western corner of the African continent. These were followed by a single clade containing major radiation back across Africa from South Africa to tropical Arabia (but no further east than Dhofar, Oman), which includes also a single early spread into Madagascar. We establish the monophyly of many of the genera, such as Echidnopsis Hook.f., Hoodia Hook., Huernia R. Br., Piaranthus R. Br., Rhytidocaulon P.R.O. Bally and Tridentea Haw., but find that Duvalia Haw., Orbea Haw., Stapelia L. and Tromotriche Haw. are polyphyletic. We show that in certain vegetative features, there is broad cohesion across clades. Florally, on the other hand, the stapeliads exhibit considerable plasticity and we are able to show that very differently shaped flowers as well as large and small flowers evolved repeatedly among closely related species.},
keywords = {Arabian Peninsula, Ceropegieae, DNA sequence data, Phylogeny, Rand Flora, Southern Africa},
pubstate = {published},
tppubtype = {article}
}
The stapeliads of the Ceropegieae (Apocynaceae–Asclepiadoideae), are approximately 340 species of stem-succulents placed in around 30 genera, found in semi-arid parts of the Old World. Here we sampled 192 species (i.e. nearly two thirds of the total) from across the full geographic range of the group and analysed data from the two nuclear regions (nuclear ribosomal ITS and ncpGS) and five plastid regions (psbA-trnH intergenic spacer, rps16 intron, trnL–trnF intergenic spacer, trnS–trnG intergenic region and the non-coding rpl32-trnL region). We find that the stapeliads radiated first in the northern hemisphere from Africa to southern Europe and Myanmar. This radiation subtends a grade of minor clades in the south-western corner of the African continent. These were followed by a single clade containing major radiation back across Africa from South Africa to tropical Arabia (but no further east than Dhofar, Oman), which includes also a single early spread into Madagascar. We establish the monophyly of many of the genera, such as Echidnopsis Hook.f., Hoodia Hook., Huernia R. Br., Piaranthus R. Br., Rhytidocaulon P.R.O. Bally and Tridentea Haw., but find that Duvalia Haw., Orbea Haw., Stapelia L. and Tromotriche Haw. are polyphyletic. We show that in certain vegetative features, there is broad cohesion across clades. Florally, on the other hand, the stapeliads exhibit considerable plasticity and we are able to show that very differently shaped flowers as well as large and small flowers evolved repeatedly among closely related species.
2010
Bruyns, P V
Huernia humpatana (Apocynaceae), a new species from southern Angola Artikel
In: South African Journal of Botany, Bd. 76, Nr. 3, S. 585 – 587, 2010, ISSN: 0254-6299.
Abstract | Links | BibTeX | Schlagwörter: Angola, Apocynaceae, Ceropegieae
@article{BRUYNS2010585,
title = {Huernia humpatana (Apocynaceae), a new species from southern Angola},
author = {P V Bruyns},
url = {http://www.sciencedirect.com/science/article/pii/S0254629910001468},
doi = {https://doi.org/10.1016/j.sajb.2010.04.013},
issn = {0254-6299},
year = {2010},
date = {2010-01-01},
journal = {South African Journal of Botany},
volume = {76},
number = {3},
pages = {585 - 587},
abstract = {A new species, Huernia humpatana Bruyns (Apocynaceae\textendashCeropegieae), closely related to H. similis N.E.Br., is described from the Chela Mountains of Huila Province in southern Angola. The two species are distinguished by the 5-angled and erect stems with more prominent tubercles up to 6mm long joined into clear angles and separated by V-shaped grooves in H. humpatana as opposed to very obtusely 4-angled stems with tubercles only 2mm long and only indistinct grooves between the angles in H. similis. Furthermore, in H. similis the nodding corolla is ±9mm in diameter with sepals ±2mm long, while in H. humpatana the horizontally facing corolla is 18\textendash20mm in diameter with sepals 4\textendash6mm long.},
keywords = {Angola, Apocynaceae, Ceropegieae},
pubstate = {published},
tppubtype = {article}
}
A new species, Huernia humpatana Bruyns (Apocynaceae–Ceropegieae), closely related to H. similis N.E.Br., is described from the Chela Mountains of Huila Province in southern Angola. The two species are distinguished by the 5-angled and erect stems with more prominent tubercles up to 6mm long joined into clear angles and separated by V-shaped grooves in H. humpatana as opposed to very obtusely 4-angled stems with tubercles only 2mm long and only indistinct grooves between the angles in H. similis. Furthermore, in H. similis the nodding corolla is ±9mm in diameter with sepals ±2mm long, while in H. humpatana the horizontally facing corolla is 18–20mm in diameter with sepals 4–6mm long.