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  1. Article: Betula mcallisteri

    Zhang, Huayu / Ding, Junyi / Holstein, Norbert / Wang, Nian

    Frontiers in plant science

    2023  Volume 14, Page(s) 1113274

    Abstract: Taxa are traditionally identified using morphological proxies for groups of evolutionarily isolated populations. These proxies are common characters deemed by taxonomists as significant. However, there is no general rule on which character or sets of ... ...

    Abstract Taxa are traditionally identified using morphological proxies for groups of evolutionarily isolated populations. These proxies are common characters deemed by taxonomists as significant. However, there is no general rule on which character or sets of characters are appropriate to circumscribe taxa, leading to discussions and uncertainty. Birch species are notoriously hard to identify due to strong morphological variability and factors such as hybridization and the existence of several ploidy levels. Here, we present evidence for an evolutionarily isolated line of birches from China that are not distinguishable by traditionally assumed taxon recognition proxies, such as fruit or leaf characters. We have discovered that some wild material in China and some cultivated in the Royal Botanic Gardens Edinburgh, formerly recognized as
    Language English
    Publishing date 2023-05-23
    Publishing country Switzerland
    Document type Journal Article
    ZDB-ID 2613694-6
    ISSN 1664-462X
    ISSN 1664-462X
    DOI 10.3389/fpls.2023.1113274
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article: Monograph of Coccinia (Cucurbitaceae).

    Holstein, Norbert

    PhytoKeys

    2015  , Issue 54, Page(s) 1–166

    Abstract: This monograph deals with all 95 names described in the Cucurbitaceae genus Coccinia and recognizes 25 species. Taxonomic novelties are Cocciniaadoensisvar.aurantiaca (C.Jeffrey) Holstein, stat. nov., Cocciniasessilifoliavar.variifolia (A.Meeuse) ... ...

    Abstract This monograph deals with all 95 names described in the Cucurbitaceae genus Coccinia and recognizes 25 species. Taxonomic novelties are Cocciniaadoensisvar.aurantiaca (C.Jeffrey) Holstein, stat. nov., Cocciniasessilifoliavar.variifolia (A.Meeuse) Holstein, stat. nov., and Cocciniaadoensisvar.jeffreyana Holstein, var. nov. For the 25 species 3157 collections were examined, of which 2024 were georeferenced to produce distribution maps. All species are distributed in sub-Saharan Africa with one species, Cocciniagrandis, extending from Senegal in West Africa east to Indonesia and being naturalized on Pacific Islands, in Australia, the Caribbean, and South America. Coccinia species are dioecious creepers or climbers with simple or bifid tendrils that occupy a range of habitats from arid scrubland, woodlands to lowland rainforest and mist forest. The corolla of Coccinia species is sympetalous, usually pale yellow to orange, and 1 to 4.5 cm long. Pollination is by bees foraging for pollen or nectar. After pollination, the developing ovary often exhibits longitudinal mottling, which usually disappears during maturation. All species produce berries with a pericarp in reddish colors (orange-red through to scarlet red), hence the generic name. The globose to cylindrical fruits contain numerous grayish-beige flat to lenticular seeds. Chromosome numbers are 2n = 20, 24, and 22 + XX/XY. Many Coccinia species are used for food, either as roasted tubers, greens as spinach, or the fruits as vegetables. Medicinal value is established in Cocciniagrandis, of which leaves and sap are used against diabetes.
    Language English
    Publishing date 2015-08-03
    Publishing country Bulgaria
    Document type Journal Article
    ZDB-ID 2579891-1
    ISSN 1314-2003 ; 1314-2011
    ISSN (online) 1314-2003
    ISSN 1314-2011
    DOI 10.3897/phytokeys.54.3285
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article: Monograph of Coccinia (Cucurbitaceae)

    Holstein, Norbert

    PhytoKeys. 2015 Aug. 3, v. 54

    2015  

    Abstract: This monograph deals with all 95 names described in the Cucurbitaceae genus Coccinia and recognizes 25 species. Taxonomic novelties are Cocciniaadoensisvar.aurantiaca (C.Jeffrey) Holstein, stat. nov., Cocciniasessilifoliavar.variifolia (A.Meeuse) ... ...

    Abstract This monograph deals with all 95 names described in the Cucurbitaceae genus Coccinia and recognizes 25 species. Taxonomic novelties are Cocciniaadoensisvar.aurantiaca (C.Jeffrey) Holstein, stat. nov., Cocciniasessilifoliavar.variifolia (A.Meeuse) Holstein, stat. nov., and Cocciniaadoensisvar.jeffreyana Holstein, var. nov. For the 25 species 3157 collections were examined, of which 2024 were georeferenced to produce distribution maps. All species are distributed in sub-Saharan Africa with one species, Cocciniagrandis, extending from Senegal in West Africa east to Indonesia and being naturalized on Pacific Islands, in Australia, the Caribbean, and South America. Coccinia species are dioecious creepers or climbers with simple or bifid tendrils that occupy a range of habitats from arid scrubland, woodlands to lowland rainforest and mist forest. The corolla of Coccinia species is sympetalous, usually pale yellow to orange, and 1 to 4.5 cm long. Pollination is by bees foraging for pollen or nectar. After pollination, the developing ovary often exhibits longitudinal mottling, which usually disappears during maturation. All species produce berries with a pericarp in reddish colors (orange-red through to scarlet red), hence the generic name. The globose to cylindrical fruits contain numerous grayish-beige flat to lenticular seeds. Chromosome numbers are 2n = 20, 24, and 22 + XX/XY. Many Coccinia species are used for food, either as roasted tubers, greens as spinach, or the fruits as vegetables. Medicinal value is established in Cocciniagrandis, of which leaves and sap are used against diabetes.
    Keywords Coccinia ; Holstein ; bees ; chromosome number ; color ; corolla ; diabetes ; dioecy ; foraging ; georeferencing ; habitats ; leaves ; nectar ; new variety ; pericarp ; plant ovary ; plant taxonomy ; pollen ; pollination ; rain forests ; sap ; seeds ; shrublands ; small fruits ; spinach ; tubers ; woodlands ; Australia ; Caribbean ; Indonesia ; Pacific Ocean Islands ; Senegal ; South America
    Language English
    Dates of publication 2015-0803
    Size p. 1-166.
    Publishing place Pensoft Publishers
    Document type Article
    ZDB-ID 2579891-1
    ISSN 1314-2003 ; 1314-2011
    ISSN (online) 1314-2003
    ISSN 1314-2011
    DOI 10.3897/phytokeys.54.3285
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: Waking sleeping beauties: a molecular phylogeny and nomenclator of Halgania (Ehretiaceae, Boraginales)

    Holstein, Norbert / Marc Gottschling

    Australian systematic botany. 2018 May, v. 31, no. 2

    2018  

    Abstract: Halgania (Ehretiaceae, Boraginales) comprises ∼20 species of ericoid shrubs endemic to Australia. The current taxonomic concepts based on morphology are confusing and are sometimes based on misidentification or lack of information about the type material. ...

    Abstract Halgania (Ehretiaceae, Boraginales) comprises ∼20 species of ericoid shrubs endemic to Australia. The current taxonomic concepts based on morphology are confusing and are sometimes based on misidentification or lack of information about the type material. We describe the morphological diversity and infer relationships using molecular phylogenetics. The five petals in all Halgania species are blue to violet (rarely white). The yellow or yellow-purple anthers are connected into a cone surrounding the single style. Differences among the species are mainly found in the indumentum of the plants, the leaf margin (i.e. degree of serration), the sepals (being either of equal or of unequal size) and the length of the beak-like anther appendages. A phylogenetic tree mainly based on ITS sequences retrieves three highly supported groups. The H. andromedifolia clade uniquely has sepals of unequal size, and the H. anagalloides clade exhibits dolabriform trichomes. The remaining taxa (constituting the H. littoralis clade) lack such diagnostic morphological traits, but are reliably retrieved as sister group to the H. anagalloides clade. As a first step towards the taxonomic revision of Halgania, we have compiled a nomenclatural list of all validly published names (at the species level and below), provide information about herbarium deposition of original material and discuss the current use of the names.
    Keywords anthers ; calyx ; corolla ; Ehretiaceae ; herbaria ; internal transcribed spacers ; leaves ; phylogeny ; plant taxonomy ; taxonomic revisions ; trichomes ; Australia
    Language English
    Dates of publication 2018-05
    Size p. 107-119.
    Publishing place CSIRO Publishing
    Document type Article
    ISSN 1446-5701
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: Flowers of Halgania (Ehretiaceae, Boraginales) are set up for being buzzed and the role of intertwining anther trichomes

    Holstein, Norbert / Marc Gottschling

    Flora. 2018 Mar., v. 240

    2018  

    Abstract: Flowers that release their powdery pollen by being vibrated through buzzing are morphologically diverse and have evolved many times independently. Most prominently, buzz-pollination is known from Solanum (Solanaceae) defining the “solanoid” flower ... ...

    Abstract Flowers that release their powdery pollen by being vibrated through buzzing are morphologically diverse and have evolved many times independently. Most prominently, buzz-pollination is known from Solanum (Solanaceae) defining the “solanoid” flower type by Knut Fægri. The flowers of buzz-pollinated, Australian Halgania resemble the actinomorphic Solanum floral architecture: The plants have a yellow anther cone with an apical pore, protruding from a widely funnel-shaped to rotate, blue to violet corolla. However, Fægri rejected the solanoid flower type for some of the Halgania species due to a contracted inflorescence, a funnel-shaped corolla or an ostensible lack of a female stage. Using light and scanning electron microscopy, we investigated traits referring to the floral architecture of Halgania and compared the flowers of different species. In all investigated species the anthers of the cone are connected via long, intertwined trichomes (denoted “capillinection”) both between the individual anthers and in the central stylar channel. The anther opening is functionally reduced to an apical pore by 1) capillinection and spatial compression of the thecal walls, leaving only small apical slits and 2) by anther appendages that unify the ten slits to a single pore. Halgania flowers are morphologically similar to each other and are buzz-pollinated. We conclude that they are all structurally and functionally matching the flowers of tomato, Solanum lycopersicum, and thus the concept of solanoid flowers as defined by Knut Fægri.
    Keywords anthers ; appendages ; corolla ; Ehretiaceae ; females ; pollen ; scanning electron microscopy ; Solanum lycopersicum ; tomatoes ; trichomes
    Language English
    Dates of publication 2018-03
    Size p. 7-15.
    Publishing place Elsevier GmbH
    Document type Article
    ZDB-ID 5580-3
    ISSN 0367-2530 ; 0373-6490
    ISSN 0367-2530 ; 0373-6490
    DOI 10.1016/j.flora.2017.12.005
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 68/12: Show issues

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  6. Article ; Online: Taxonomy: stable taxon boundaries.

    Holstein, Norbert / Luebert, Federico

    Nature

    2017  Volume 548, Issue 7666, Page(s) 158

    MeSH term(s) Phylogeny
    Language English
    Publishing date 2017--09
    Publishing country England
    Document type Letter ; Comment
    ZDB-ID 120714-3
    ISSN 1476-4687 ; 0028-0836
    ISSN (online) 1476-4687
    ISSN 0028-0836
    DOI 10.1038/548158d
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 26: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
    Jg. 1995 - 2021: Lesesall (1.OG)
    ab Jg. 2022: Lesesaal (EG)
    Zs.MG 9: Show issues
    Zs.MO 244: Show issues

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  7. Article: Evolution of Impatiens (Balsaminaceae) in the Albertine Rift – The endemic Impatiens purpureoviolacea complex consists of ten species

    Fischer, Eberhard / Abrahamczyk, Stefan / Holstein, Norbert / Janssens, Steven B.

    Taxon. 2021 Dec., v. 70, no. 6

    2021  

    Abstract: The Albertine Rift harbours a highly diverse flora with numerous endemic species. An important component of the forest understorey is the herbaceous genus Impatiens. Fieldwork in Burundi, the Democratic Republic of the Congo and Rwanda as well as ... ...

    Abstract The Albertine Rift harbours a highly diverse flora with numerous endemic species. An important component of the forest understorey is the herbaceous genus Impatiens. Fieldwork in Burundi, the Democratic Republic of the Congo and Rwanda as well as morphological studies indicated that the Albertine Rift endemic Impatiens purpureoviolacea represents a species complex. We analyzed the hidden diversity of the complex using morphological and molecular data supplemented by herbarium studies. We found that the Impatiens purpureoviolacea complex can be divided into morphologically and phylogenetically well characterized clades containing ten species and a natural hybrid. We describe all of these species, provide a species key and analyze their evolutionary history. Beside Impatiens purpureoviolacea and I. gesneroidea, the already described I. urundiensis is resurrected from synonymy. Two varieties, Impatiens purpureoviolacea var. longicalcarata and I. gesneroidea var. superglabra are raised to species status, and five new species (Impatiens elwiraurzulae, I. lotteri, I. ludewigii, I. lutzmannii, I. versicolor) and a new natural hybrid (I. ×troupinii) are described. Within the mostly insect‐pollinated species of the clade, two bird‐pollinated species (Impatiens gesneroidea, I. superglabra) evolved independently. The clade split from its sister taxon in the Pliocene and started diversifying during the Pliocene/Pleistocene transition in parallel to an increased mountain uplifting and volcanic activity in the Albertine Rift. It further diversified during the Pleistocene, likely due to the changes in forest cover and connectivity induced by climatic fluctuations.
    Keywords Impatiens ; Pleistocene epoch ; Pliocene epoch ; bird pollination ; flora ; forests ; herbaria ; hybrids ; indigenous species ; insect pollination ; new species ; phylogeny ; understory ; volcanic activity ; Burundi ; Democratic Republic of the Congo ; Rwanda
    Language English
    Dates of publication 2021-12
    Size p. 1273-1299.
    Publishing place John Wiley & Sons, Inc.
    Document type Article
    Note JOURNAL ARTICLE
    ZDB-ID 204216-2
    ISSN 0040-0262
    ISSN 0040-0262
    DOI 10.1002/tax.12566
    Database NAL-Catalogue (AGRICOLA)

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    In stock of ZB MED Bonn / Germany

    Z 4975: Show issues

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  8. Book ; Online ; Thesis: Evolution, biogeography, and monographic treatment of Coccinia (Cucurbitaceae)

    Holstein, Norbert

    2012  

    Author's details Norbert Holstein
    Language German
    Size Online-Ressource, Ill., graph. Darst.
    Document type Book ; Online ; Thesis
    Thesis / German Habilitation thesis Univ., Diss.--München, 2012
    Database Former special subject collection: coastal and deep sea fishing

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  9. Book ; Online ; Thesis: Evolution, biogeography, and monographic treatment of Coccinia (Cucurbitaceae)

    Holstein, Norbert

    2012  

    Author's details Norbert Holstein
    Language German
    Size Online-Ressource, Ill., graph. Darst.
    Document type Book ; Online ; Thesis
    Thesis / German Habilitation thesis Univ., Diss.--München, 2012
    Database Library catalogue of the German National Library of Science and Technology (TIB), Hannover

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  10. Article ; Online: A dated phylogeny and collection records reveal repeated biome shifts in the African genus Coccinia (Cucurbitaceae)

    Renner Susanne S / Holstein Norbert

    BMC Evolutionary Biology, Vol 11, Iss 1, p

    2011  Volume 28

    Abstract: Abstract Background Conservatism in climatic tolerance may limit geographic range expansion and should enhance the effects of habitat fragmentation on population subdivision. Here we study the effects of historical climate change, and the associated ... ...

    Abstract Abstract Background Conservatism in climatic tolerance may limit geographic range expansion and should enhance the effects of habitat fragmentation on population subdivision. Here we study the effects of historical climate change, and the associated habitat fragmentation, on diversification in the mostly sub-Saharan cucurbit genus Coccinia , which has 27 species in a broad range of biota from semi-arid habitats to mist forests. Species limits were inferred from morphology, and nuclear and plastid DNA sequence data, using multiple individuals for the widespread species. Climatic tolerances were assessed from the occurrences of 1189 geo-referenced collections and WorldClim variables. Results Nuclear and plastid gene trees included 35 or 65 accessions, representing up to 25 species. The data revealed four species groups, one in southern Africa, one in Central and West African rain forest, one widespread but absent from Central and West African rain forest, and one that occurs from East Africa to southern Africa. A few individuals are differently placed in the plastid and nuclear ( LFY ) trees or contain two ITS sequence types, indicating hybridization. A molecular clock suggests that the diversification of Coccinia began about 6.9 Ma ago, with most of the extant species diversity dating to the Pliocene. Ancestral biome reconstruction reveals six switches between semi-arid habitats, woodland, and forest, and members of several species pairs differ significantly in their tolerance of different precipitation regimes. Conclusions The most surprising findings of this study are the frequent biome shifts (in a relatively small clade) over just 6 - 7 million years and the limited diversification during and since the Pleistocene. Pleistocene climate oscillations may have been too rapid or too shallow for full reproductive barriers to develop among fragmented populations of Coccinia, which would explain the apparently still ongoing hybridization between certain species. Steeper ecological gradients in East Africa and South Africa appear to have resulted in more advanced allopatric speciation there.
    Keywords Biology (General) ; QH301-705.5 ; Science ; Q ; DOAJ:Biology ; DOAJ:Biology and Life Sciences ; Evolution ; QH359-425
    Subject code 590 ; 580
    Language English
    Publishing date 2011-01-01T00:00:00Z
    Publisher BioMed Central
    Document type Article ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

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