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| Registros recuperados: 13 | |
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| Welzen, Peter C. van; Bulalacao, Lolita J.; Ôn, Tran van. |
| Trigonopleura, a genus from W Malesia, has three species, the widespread T. malayana (Malay Peninsula, Sumatra, Borneo, Sulawesi) and the two endemic species T. dubia (Philippines) and T. macrocarpa (Sarawak, Kuching). The species differ slightly from each other in leaf size, colour, and margin, flower and fruit size, fruit wall thickness, and aril size. A phylogenetic analysis was not performed, but it is argued that both endemic species split off separately from T. malayana. Trigonopleura is probably related to Chaetocarpus, in particular to C. castanocarpus. Probably, Chaetocarpus is a paraphyletic group of species and will be monophylitic when united with Trigonopleura, but this will need thorough phylogenetic research. Here, both genera are kept... |
| Tipo: Article / Letter to the editor |
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| Ano: 1995 |
URL: http://www.repository.naturalis.nl/record/524606 |
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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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| Thin, Nguyen Nghia; Duc, Vu Hoai; Welzen, Peter C. van. |
| The genus Strophioblachia Boerl. is very variable, but does not show any gaps in characters, which can be used for a further delimitation of taxa. This is shown for characters like habit, leaf blade shape, leaf blade base, staminate petals and disc lobes, bracts, and the fimbriae of the pistillate calyx. The characters show their differences on the same specimen (e.g., leaf shape), within the same area (e.g., size and number of staminate petals), or in different areas of the distribution range (e.g., efimbriate pistillate calices in China, Thailand, and Sulawesi). Therefore, the formerly recognized species and varieties are united into a single accepted species, S. fimbricalyx. |
| Tipo: Article / Letter to the editor |
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| Ano: 1998 |
URL: http://www.repository.naturalis.nl/record/526198 |
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| Welzen, Peter C. van; Banka, Roy A.; Leoncito, Cecilia D.. |
| The West Malesian genus Cheilosa Blume has been revised; the variability of the only species, C. montana Blume, will be described. Cheilosa montana combines the two former species C. montana and C. malayana (Hook. f.) Airy Shaw. Typical for Cheilosa are the presence of glands in the teeth of the leaves; thyrsoid, mainly unbranched, ramiflorous to terminal inflorescences; absence of petals; the presence of a disc; 9 or 10 stamens; 3- (rarely 4)-locular ovaries with one ovule per locule; thick-walled fruits; an aril around the seed; and endosperm. Fascicled hairs are usually present on the lower surface of the leaves, but are caducous. The excluded C. whiteana Croizat is provisionally transferred as a new species to Trigonostemon by Airy Shaw. |
| Tipo: Article / Letter to the editor |
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| Ano: 1993 |
URL: http://www.repository.naturalis.nl/record/525747 |
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| Sagun, Vernie G.; Welzen, Peter C. van. |
| Micrococca is a rare genus represented in the Malesian region by only three species. Micrococca mercurialis (L.) Benth. is widespread, but in Malesia it is found only in Peninsular Malaysia. Micrococca malaccensis Airy Shaw and M. johorica Airy Shaw are both endemic to Johore. Micrococca can be distinguished from its close allies, Erythrococca and Claoxylon, by its interrupted racemes (with long internodes), pistillate flowers with elongated (strap-like) disc lobes, and a deeply 3-lobed, thinly crustaceous capsule dehiscing both septicidally and loculicidally. Micrococca mercurialis is a small-leaved shrub, while the other two species are trees with much larger leaves. Micrococca johorica has glands on the leaf bases, narrow leaves, and short... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Claoxylon; Erythrococca; Euphorbiaceae; Micrococca; Malesia; Taxonomy. |
| Ano: 2002 |
URL: http://www.repository.naturalis.nl/record/524872 |
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| Welzen, Peter C. van. |
| A phylogeny of the complete tribe Chrozophoreae is presented in order to establish the possible monophyly and relationships in subtribes Chrozophorinae (Chrozophora) and Doryxylinae ( Doryxylon, Melanolepis, Sumbaviopsis, Thyrsanthera). Added are the other subtribes in tribe Chrozophoreae, the Speranskiinae (Speranskia) and Ditaxinae ( Argythamnia, Caperonia, Chiropetalum, Ditaxis, Philyra). Outgroups are the genera Agrostistachys and Chondrostylis (tribe Agrostistachydeae). The phylogeny shows two monophyletic groups, subtribe Speranskiinae together with Ditaxinae, and subtribe Chrozophorinae with Doryxylinae. The latter group is statistically well supported by a high bootstrap value. The first group is weakly supported and collapses easily when the... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Chrozophora; Doryxylon; Sumbaviopsis; Thyrsanthera; Phylogeny; Taxonomy. |
| Ano: 1999 |
URL: http://www.repository.naturalis.nl/record/525537 |
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| Welzen, Peter C. van. |
| The Erismantheae (monoecious, leaves opposite, stipules interpetiolar) contain three genera, Moultonianthus (monotypic), and Erismanthus and Syndyophyllum, each with 2 species. Moultonianthus is recognized by its persistent, large, cordate stipules; Erismanthus is characterized by the catkin-like staminate inflorescences with very long-pedicelled flowers; and characteristic for Syndyophyllum are the inflorescences with both staminate flowers (in bundles) and pistillate flowers (one per bundle of staminate flowers). Both varieties of Syndyophyllum occidentale are now considered to be distinctive species, because an additional difference was found (one axillary bud of each leaf pair present halfway along the petiole or not). The phylogenetic analysis of the... |
| Tipo: Article / Letter to the editor |
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| Ano: 1995 |
URL: http://www.repository.naturalis.nl/record/525391 |
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| Welzen, Peter C. van. |
| A cladogram of the subtribe Lasiococcinae (Homonoia, 2 species, Lasiococca, 3 species, and Spathiostemon, 2 species) is presented with the genus Wetria as outgroup. All three taxa are monophyletic groups of species with Lasiococca and Spathiostemon as sistergroups and Homonoia related to both of them. Within Lasiococca, L. comberi and L. malaccensis are probably closest related. The two species of Homonoia are rheophytes, one is restricted to India where it shows two distinct forms, the other species is widespread from India throughout Malesia. Lasiococca is represented by one species in Malesia, L. malaccensis, only known from three localities, ranging from the Malay Peninsula to Sulawesi and the Lesser Sunda Islands. Spathiostemon has two species in... |
| Tipo: Article / Letter to the editor |
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| Ano: 1998 |
URL: http://www.repository.naturalis.nl/record/525568 |
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| Registros recuperados: 13 | |
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