Zobrazeno 1 - 10 of 103 pro vyhledávání: '"H. A. Valkenburg"'
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Akademický článek
The large Gunnera's (G. tinctoria and G. manicata) in Europe in relation to EU regulation 1143/2014.
Autor: Johan L C H van Valkenburg, Bruce A Osborne, Marcel Westenberg
Publikováno v: PLoS ONE, Vol 18, Iss 4, p e0284665 (2023)
Incorrect labelling of plants in the horticultural trade and misidentification is widespread. For the inspection services of the EU member states, correct identification of G. tinctoria has become important since the species was added to the List of
Externí odkaz: https://doaj.org/article/1e5578983d304f28b031f298845141ba
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3
Pollen morphology of the African Sclerosperma (Arecaceae)
Autor: Johan L. C. H. Van Valkenburg, Friðgeir Grímsson, Reinhard Zetter, Jan J. Wieringa, Bonnie F. Jacobs, Alexandros Xafis
Publikováno v: Grana. 58:99-113
Three currently accepted Sclerosperma species appear to produce four different pollen morphologies. Sclerosperma mannii and S. walkeri pollen share the same distinct reticulate sculpture, but S. profizianum produces three different pollen types (micr
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6e28ba6c92db90df9c02972febbe6856
https://doi.org/10.1080/00173134.2018.1519033
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4
Sclerosperma fossils from the late Oligocene of Chilga, north-western Ethiopia
Autor: Reinhard Zetter, Johan L. C. H. Van Valkenburg, Friðgeir Grímsson, Aaron D. Pan, Bonnie F. Jacobs, Alexandros Xafis, Jan J. Wieringa, Neil J. Tabor
Publikováno v: Grana
The palm family, Arecaceae, is notoriously depauperate in Africa today, and its evolutionary, paleobiogeographic, and extinction history there are not well documented by fossils. In this article we report the pollen of two new extinct species of the
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6fe5815c1a2031803ea6f08bb0c6dd05
http://europepmc.org/articles/PMC6382288
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5
Pollen morphology of the African
Autor: Friðgeir, Grímsson, Johan L C H, van Valkenburg, Jan J, Wieringa, Alexandros, Xafis, Bonnie F, Jacobs, Reinhard, Zetter
Publikováno v: Grana
Three currently accepted Sclerosperma species appear to produce four different pollen morphologies. Sclerosperma mannii and S. walkeri pollen share the same distinct reticulate sculpture, but S. profizianum produces three different pollen types (micr
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=pmid________::6944fa5e64164be37ad66ac4f1580dd9
https://pubmed.ncbi.nlm.nih.gov/30828286
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6
DNA barcoding discriminates the noxious invasive plant species, floating pennywort (Hydrocotyle ranunculoidesL.f.), from non-invasive relatives
Autor: Marinus J. M. Smulders, J.R. van der Schoot, C.C.M. van de Wiel, H. Duistermaat, J. L. C. H. van Valkenburg
Publikováno v: Molecular Ecology Resources 9 (2009) 4
Molecular Ecology Resources, 9(4), 1086-1091
Floating pennywort (Hydrocotyle ranunculoides L.f.), a member of the plant family Araliaceae originating from North America, is an example of an invasive aquatic species posing serious problems to the management of waterways outside of its original d
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f968318144363303bf523669a615c89a
https://doi.org/10.1111/j.1755-0998.2009.02547.x
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7
A revision of the genus Podococcus (Arecaceae)
Autor: J. L. C. H. van Valkenburg, Terry Sunderland
Publikováno v: Kew Bulletin. 63:251-260
A taxonomic revision of the palm genus Podococcus (Arecaceae) is presented. Two species are recognised: P. barteri, a species relatively widespread in a coastal band from Nigeria to the D. R. Congo and P. acaulis, a species previously considered cons
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::1da1c95123cdb8ca9cbf5fd91feb587d
https://doi.org/10.1007/s12225-008-9037-7
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8
A revision of the genus Sclerosperma (Arecaceae)
Autor: J. L. C. H. van Valkenburg, Terry Sunderland, Thomas L. P. Couvreur
Publikováno v: Kew Bulletin 63 (2008) 1
Kew Bulletin, 63(1), 75-86
Summary A taxonomic revision of the palm genus Sclerosperma (Arecaceae) is presented. Three species are recognised: S. mannii H. Wendl., which is relatively widespread from Liberia to the Democratic Republic of Congo; S. walkeri A. Chev., which is ap
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d9e5ab6dc5a945ec5b4856267b404e54
https://doi.org/10.1007/s12225-007-9002-x
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10
Efficient distinction of invasive aquatic plant species from non-invasive related species using DNA barcoding
Autor: G.D. Esselink, H. Duistermaat, L. P. Kodde, C.C.M. van de Wiel, S H Marashi, J. L. C. H. van Valkenburg, Marinus J. M. Smulders, R. Ghahramanzadeh
Publikováno v: Molecular Ecology Resources 13 (2013) 1
Molecular Ecology Resources, 13(1), 21-31
Biological invasions are regarded as threats to global biodiversity. Among invasive aliens, a number of plant species belonging to the genera Myriophyllum, Ludwigia and Cabomba, and to the Hydrocharitaceae family pose a particular ecological threat t
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::518a9cfc53e30e069c530803a05ea026
https://pubmed.ncbi.nlm.nih.gov/23039943
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