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| Registros recuperados: 60 | |
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| Welzen, P.C. van; Esser, H.-J.. |
| The most recent phylogenetic analyses of the Malphigiales place the family Rafflesiaceae in the Euphorbiaceae, near the base of the clade. Combining both families is not an attractive option, because the Rafflesiaceae are very recognisable, while the Euphorbiaceae is one of the most polymorphic families around. The solution is to recognize the basal part of the Euphorbiaceae as Peraceae, which will leave the Rafflesiaceae and rest of the Euphorbiaceae untouched. The typical characters of the Peraceae are discussed. Within Malesia the family contains two genera, Chaetocarpus (1 species) and Trigonopleura (3 species). All species are mainly west Malesian taxa. They have as shared typical characters obovate stipules, united stamens and densely hairy fruits.... |
| Tipo: Article / Letter to the editor |
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| Ano: 2013 |
URL: http://www.repository.naturalis.nl/record/579376 |
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| Sierra, S.E.C.; Aparicio, M.; Gebraad, M.J.H.; Kulju, K.K.M.; Welzen, P.C. van. |
| The range of diagnostic morphological features in the whole genus Mallotus is reviewed as background to the taxonomic treatment of section Rottleropsis s.l. Special emphasis is given to the indumentum, habit, stipules, leaves, extrafloral nectaries, domatia, inflorescences, flowers, pollen and fruits. Notes on the geographical distribution, ecology, pollinators, fruit and seed dispersal, and uses of the genus are also presented. The section Axenfeldia is reduced to sect. Rottleropsis on account of the absence of suitable morphological characters to distinguish them. A taxonomic revision of 38 species of sect. Rottleropsis s.l. from Malesia, Thailand and Africa is presented, together with regional and synoptical identification keys, distribution maps and... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Euphorbiaceae; Axenfeldia; Mallotus; Rottleropsis; Malesia; Thailand; Africa. |
| Ano: 2007 |
URL: http://www.repository.naturalis.nl/record/524640 |
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| Slik, J.W.F.; Welzen, P.C. van. |
| Mallotus sections Hancea and Stylanthus from Malesia are revised. Descriptions, distribution ranges, habit drawings and keys to all the species in these two sections are provided. The diagnostic characters for the sections are discussed briefly in the section headings. Mallotus section Hancea is defined more precisely than before, resulting in the exclusion of 4 species from this section (M. brachythyrsus, M. havilandii, M. insularum (new rank) and M. miquelianus). Mallotus beccarii is synonymised with M. brachythyrsus, and M. tenuipes with M. penangensis. This section contains 12 species. In Mallotus section Stylanthus, M. oblongifolius is synonymised with M. peltatus. This section contains 6 species. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Mallotus; Section Hancea; Section Stylanthus; Malesia; Taxonomy. |
| Ano: 2001 |
URL: http://www.repository.naturalis.nl/record/525368 |
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| Welzen, P.C. van; Sierra, S.E.C.. |
| The Mallotus wrayi King ex Hook.f. complex on the Sunda Shelf of the Malay Archipelago (Malay Peninsula, Sumatra, Java, Borneo) appeared to comprise four species instead of a single, very heterogeneous one. Two synonyms (M. caudatus Merr. and M. lancifolius Hook.f.) are resurrected and a new species, M. spinifructus, is described. Important characters can be found in the density of the hairs (glandular scale-like, simple or stellate), type of stellately bundled hairs, lengths of inflorescences, bracts, and bracts of the terminal bud, and in the stigma width and hairiness. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Euphorbiaceae; Mallotus; Sunda Shelf; Malesia. |
| Ano: 2006 |
URL: http://www.repository.naturalis.nl/record/524771 |
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| Welzen, P.C. van; Gadella, T.W.J.; Maas, P.J.M.; Daly, D.C.; Mori, S.A.; Jørgensen, P.M.; Obermüller, F.A.; Kjellberg, F.; Rønsted, N.; Chantarasuwan, B.; Lut, C.W.J.. |
| Tipo: Article / Letter to the editor |
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| Ano: 2012 |
URL: http://www.repository.naturalis.nl/record/525008 |
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| Welzen, P.C. van; Winkel, E.. |
| The variability of Ostodes paniculata var. paniculata, the only representative of the genus in Malesia, is described. The variety and the species have a disjunct distribution as they are found in India to Southern China and the Southeast Asian mainland, Sumatra and Java. The variability in leaf glands, domatia, sepals, and seeds shows geoclines. Depending on one’s view the genus has two more varieties or species, both more hairy and occurring from N Thailand to China or in China only. Their nomenclature is provided, as is the nomenclature of the many excluded species, once part of a larger generic concept of Ostodes, but now mainly part of Dimorphocalyx and Paracroton. Typical for Ostodes are the red latex, the ovate, rather large serrate leaf blades with... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Dimorphocalyx; Euphorbiaceae; Malesia; Ostodes; Paracroton; Trigonostemon. |
| Ano: 2015 |
URL: http://www.repository.naturalis.nl/record/578359 |
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| Welzen, P.C. van; Piskaut, P.; Windadri, F.I.. |
| The genus Lepidopetalum Blume (Sapindaceae) contains 6 species, of which one, L. fructoglabrum, is newly described. Four species are found on New Guinea of which one also occurs in Australia, one on the Nicobar Islands and Sumatra and one on the Philippines. Specimens from Java, Sulawesi, the Moluccas, and the Lesser Sunda Islands could not be identified due to the lack of mature fruits. The genus is characterized by typical domatia (hair tufts), petals (small, triangular with much larger, usually united scales), and fruits (flat, usually 2-locular, sarcotesta present). Important specific characters are the pilosity of the upper part of the pedicel, the shape of the disc, the type of hairs inside the fruit, and the type of sarcotesta. A putative... |
| Tipo: Article / Letter to the editor |
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| Ano: 1992 |
URL: http://www.repository.naturalis.nl/record/524660 |
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| Duistermaat, Helena; Balgooy, M.M.J. van; Welzen, P.C. van; Esser, H.-J.; Middleton, David; Adema, Frits; Veldkamp, J.F.. |
| The International Conference ‘Compositae: Systematics, Biology, Utilization’ held in 1994 inspired the authors, on the suggestion of Dr. K. Ferguson, to publish a book accommodating more general systematic papers on Asteraceae, resulting in the present work. It contains seventeen chapters [in English, French (1), and Spanish (1)], including the Introduction by C. Jeffrey, and is provided with a taxonomic index. Following the Introduction, Jeffrey gives a review of the developments in Asteraceae systematics during the last 20 years, since the conference of 1975. I agree with him that improvements are possible in the use of cladistic analysis in taxonomy, but it seems to me that his review is a bit too negative in this respect. Advances in Compositae... |
| Tipo: Article / Letter to the editor |
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| Ano: 1997 |
URL: http://www.repository.naturalis.nl/record/525946 |
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| Sierra, S.E.C.; Welzen, P.C. van; Slik, J.W.F.. |
| A revision of Mallotus section Philippinenses (former section Rottlera) in Malesia and Thailand is given. Descriptions, distribution maps, habit drawings, and a key to the species are provided. The diagnostic characters for the section are briefly discussed. Five species (M. kongkandae, M. leptostachyus, M. pallidus, M. philippensis, and M. repandus) are recognised. Mallotus chromocarpus is excluded from the section because it has more shared characters with the monospecific genus Octospermum, like the presence of indehiscent fruits, absence of stipules, marginal extrafloral nectaries on the upper side of the leaf blade, broad connectives (shaped umbrella-like), and its occurrence in New Guinea, and is therefore probably closely related to it. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Euphorbiaceae; Rottlerinae; Mallotus; Philippinenses; Rottlera; Octospermum; Malesia; Taxonomy. |
| Ano: 2005 |
URL: http://www.repository.naturalis.nl/record/525257 |
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| Welzen, P.C. van; Forster, P.I.. |
| Formerly, the Picrodendraceae formed the subfamily Oldfieldioideae within the Euphorbiaceae. The introduction discusses the taxonomy, wood and pollen morphology. Only four genera are present in Malesia. Three of them are either monotypic (Kariothamnus) or comprise only a single species (Choriceras and Petalostigma) in New Guinea. Austrobuxus (three species) is the only widespread genus in Malesia. The taxonomic treatment contains descriptions, keys, drawings and notes on distribution, ecology, etc. |
| Tipo: Article / Letter to the editor |
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| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/579372 |
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| Registros recuperados: 60 | |
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