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| Registros recuperados: 91 | |
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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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| Sevilla, Sofia; Welzen, Peter C. van. |
| The genera Agrostistachys and Chondrostylis, subtribe Agrostistachydeae, have been revised. Chondrostylis comprises two species, C. bankana appears to be much more widespread than was assumed. Agrostistachys comprises six species, one of which is new ( (A. staminodiatus), while several species (e.g. A. intramarginalis and A. meeboldii) have been reduced to the now quite variable A. borneensis, formerly mainly known as. A. longifolia. A phylogenetic analysis of the subtribe Agrostistachydeae shows that all four genera (also Cyttaranthus and I Pseudagrostistachys) are monophyletic; however, the position of Agrostistachys is very weak and the genus may easily change to a paraphyletic group with the other genera nested in it. Even in spite of the weak support... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Agrostistachys; Chondrostylis; Euphorbiaceae; Phylogeny. |
| Ano: 2001 |
URL: http://www.repository.naturalis.nl/record/525139 |
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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; 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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| 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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| Esser, Hans-Joachim. |
| The Hippomaneae (Euphorbiaceae) are revised for Malesia. Only Excoecaria and Homalanthus are excluded. A key to all Malesian genera is provided. The generic concepts applied differ markedly from previous treatments for the region with the following genera accepted: Balakata, Falconeria, Gymnanthes, Microstachys, Sapium, Shirakiopsis, Stillingia and Triadica. All of these genera show peculiarities in biogeography and ecology, which are discussed. Among these genera only Stillingia is kept as traditionally used. Balakata (based on Sapium sect. Pleurostachya) and Shirakiopsis (based on Sapium sect. Parasapium but excluding its type) are described as new genera; Falconeria, Microstachys and Triadica are re-established as distinct genera having been treated as... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Euphorbiaceae; Hippomaneae; Malesia. |
| Ano: 1999 |
URL: http://www.repository.naturalis.nl/record/525910 |
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| Welzen, P.C. van. |
| Fourteen species of Sauropus are recognised for Malesia, 21 for Thailand. Two species are described as new, S. asymmetricus of Sumatra and S. shawii of Borneo. Many new synonyms, especially for S. androgynus and S. rhamnoides, are provided. The latter two species have a much wider distribution than described before and both are difficult to separate from each other. A phylogeny based on morphological and palynological data proved futile, but showed that Sauropus together with Breynia and Glochidion are embedded in the paraphyletic Phyllanthus. Most species which formerly belonged to Synostemon and are now included in Sauropus are probably, with the exception of S. bacciformis, related to Breynia and Glochidion. Because of the poor phylogenetic results the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Euphorbiaceae; Sauropus; Synostemon; Malesia; Thailand. |
| Ano: 2003 |
URL: http://www.repository.naturalis.nl/record/525088 |
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| Ottens-Treurniet, M.A.D.; Welzen, P.C. van. |
| The genus Blumeodendron (Euphorbiaceae) comprises nine species and is distributed from the Andaman Islands and Myanmar in the west through Malesia to the Bismarck Archipelago in the east. Two species are newly described, B. gesinus, with ridged fruits, and B. endocarpum, with a thickened endocarp around each seed. Three former synonyms, B. novoguineense (new name for Bennettia papuanum), B. philippinense and B. subrotundifolium, are reinstated as species. Two important characters were newly discovered, the presence of small lepidote hairs in all species and the indehiscent fruit of B. endocarpum |
| Tipo: Article / Letter to the editor |
Palavras-chave: Blumeodendron; Euphorbiaceae; Malesia; Revision; Taxonomy. |
| Ano: 2016 |
URL: http://www.repository.naturalis.nl/record/607279 |
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| Welzen, P.C. van. |
| Dicoelia was always considered to be a monotypic genus. Typical are the hooded (cucullate) petals that form cavities in which juvenile thecae of adjacent stamens are protected. Specimens of Sumatra appear to represent a new species. The Sumatran specimens have stipules that fall slightly later and they show morphological differences in the pistillate petals, pistillode, columella and hilum. Newly described structures are disc glands (thought to be absent), probably not functional, but present in the flowers of both sexes and a gynophore in the pistillate flowers. Dicoelia is considered as a member of the Phyllanthaceae conforming with the latest molecular phylogenetic results; a classification that agrees with the presence of two ovules per locule. |
| Tipo: Article / Letter to the editor |
Palavras-chave: Dicoelia; Disc glands; Euphorbiaceae; Gynophore; Malesia; Phyllanthaceae. |
| Ano: 2011 |
URL: http://www.repository.naturalis.nl/record/524830 |
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| Sagun, V.G.; Levin, G.A.; Welzen, P.C. van. |
| Twenty-eight species of Acalypha are recognized in Malesia. Acalypha paniculata is the sole member of subgenus Linostachys in Malesia and the rest of the species belong to subgenus Acalypha. Four previously synonymized species are resurrected as distinct species, namely A. angatensis, A. cardiophylla var. cardiophylla, A. grandis, and A. wilkesiana. Four species names are newly reduced to synonymy. The molecular phylogenetic analyses indicate that Acalypha is monophyletic, as is the subgenus Acalypha. The early-diverging lineages in the genus, and its closest outgroup, consist of African species. The Malesian species do not form a monophyletic group although the molecular data strongly support two small clades within the region that are morphologically... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Acalypha; Euphorbiaceae; Malesia; Phylogeny. |
| Ano: 2010 |
URL: http://www.repository.naturalis.nl/record/526264 |
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| Registros recuperados: 91 | |
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