SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

Welzen, P.C. van; Baas, P..

The leaf anatomy of the Linaceae complex (Linaceae s.s., Hugoniaceae, Ixonanthaceae, Humiriaceae and Erythroxylaceae) and putative allies ( Ctenolophon, Lepidobotrys, Irvingiaceae) is surveyed, mostly on the basis of original observations (72 specimens, 27 genera), partly from data in the literature. Diversity in stomatal type, midrib and petiole vascularisation, sclerenchyma support, foliar sclereids, mucilage cells, secretory cavities, and cristarque cells provide evidence in favour of a separate family status of the members of the Linaceae complex. Allantospermum and Cyrillopsis are best accommodated in the Ixonanthaceae. Irvingiaceae (often treated in or near Simaroubaceae) show similarities with the Linaceae complex, albeit more closely to the...

Revision of the genus Cleidion (Euphorbiaceae) in Malesia

Ano: 1984

URL: http://www.repository.naturalis.nl/record/526014

Kulju, K.K.M.; Welzen, P.C. van.

A revision of the Malesian species in the genus Cleidion is presented. Cleidion javanicum is shown to be the correct name for the widespread type species (instead of the name C. spiciflorum). A new species, C. luziae, resembling C. javanicum, is described from the Moluccas, New Guinea and the Solomon Islands. In addition, C. salomonis is synonymised with C. papuanum and C. lanceolatum is treated as a variety of C. ramosii. In total 7 Malesian Cleidion species are recognized. Cleidion megistophyllum from the Philippines cannot reliably be confirmed to belong to the genus due to lack of information and specimens and is treated as a doubtful species.

A taxonomic revision of the genus Arthraxon Beauv. (Gramineae)

Palavras-chave: Cleidion; Acalypheae; Cleidiinae; Revision; Taxonomy; Malesia.

Ano: 2005

URL: http://www.repository.naturalis.nl/record/524437

A world-revision of Arthraxon Beauv. ( Gramineae) is presented. Three wide-spread species, A. hispidus (Thunb.) Makino, A. lanceolatus (Roxb.) Hochst., and A. lancifolius (Trin.) Hochst. are very variable and have caused the description of a great number of taxa, most of which are here reduced to synonomy. There are now 7 species and 9 varieties; for 6 of the latter new combinations are proposed. No new taxa are described.

Taxonomy, phylogeny, and geography of Neoscortechinia Hook. f. ex Pax (Euphorbiaceae)

Ano: 1981

URL: http://www.repository.naturalis.nl/record/525125

Six species are recognized in Neoscortechinia, two more than before, because N. angustifolia is raised to species level and N. forbesii is split into N. philippinensis (new combination) and N. forbesii s.s. The varieties of N. kingii are united. The genus Cheilosa, which closely resembles Neoscortechinia, is kept separate and it is used as the outgroup in the cladistic analysis of Neoscortechinia. The latter analysis resulted into a cladogram, which shows a first branching off of the sister species N. angustifolia and N. sumatrensis, followed by a subsequent branching off of N. nicobarica, N. philippinensis, and finally N. forbesii and N. kingii. Four of the six species show a wide-spread distribution in W Malesia ( N. kingii, N. nicobarica, N....

Revision of the Malesian species of Dimorphocalyx (Euphorbiaceae)

Ano: 1994

URL: http://www.repository.naturalis.nl/record/525713

Welzen, P.C. van; Oostrum, A.F. van.

Dimorphocalyx, a small genus ranging from Sri Lanka to Indomalesia to Australia, has eight species in Malesia, of which one is here raised from variety to species level and another, endemic in the N Moluccas, is newly described. Dimorphocalyx murinus and – tentatively – D. loheri are synonymised with D. denticulatus, and D. luzoniensis is synonymised with D. malayanus. Dimorphocalyx cumingii is regarded as a species of Trigonostemon. The differences between Dimorphocalyx, Ostodes, Paracroton (formerly Fahrenheitia), and Trigonostemon are discussed.

The distinction of five Mallotus species formerly in section Hancea (Euphorbiaceae)

Palavras-chave: Dimorphocalyx; Euphorbiaceae; Malesia; Ostodes; Paracroton; Trigonostemon.

Ano: 2015

URL: http://www.repository.naturalis.nl/record/578366

Welzen, P.C. van; Sierra, S.E.C.; Gebraad, M.J.H.; Kulju, K.K.M..

Mallotus concinnus Airy Shaw, M. havilandii Airy Shaw, M. insularum (Airy Shaw) Slik, and M. miquelianus (Scheff.) Boerl. are very similar in appearance, with opposite leaves of which one large and elliptic, and the other reduced and more or less obcordate. However, a detailed look revealed enough differences to regard them as distinct species.

A taxonomic revision of Trigonostemon (Euphorbiaceae) in Malesia

Palavras-chave: Euphorbiaceae; Hancea; Mallotus.

Ano: 2006

URL: http://www.repository.naturalis.nl/record/525901

Yu, R.-Y.; Welzen, P.C. van.

Trigonostemon is taxonomically revised for Malesia based on herbarium collections and field observations. Thirty-eight species are recognized in Malesia, of which four of uncertain status and four newly described. The previous infrageneric classifications are briefly reviewed, but none is accepted. Some useful characters are discussed. An identification key, nomenclature, descriptions, typification, geographic distributions and taxonomic notes are provided.

Bischofia and Hymenocardia (Phyllanthaceae) in Malesia

Palavras-chave: Euphorbiaceae; Malesia; Morphological revision; Taxonomy; Trigonostemon.

Ano: 2018

URL: http://www.repository.naturalis.nl/record/643352

The genera Bischofia and Hymenocardia both have a single species in Malesia. The two genera were always difficult to classify, both once formed their own family, but are now firmly embedded in the Phyllanthaceae. Of both genera a more complete nomenclature and biogeography is presented.

Nineteen new species and a new combination in Guioa Cav. (Sapindaceae)

Palavras-chave: Bischofia; Euphorbiaceae; Hymenocardia; Malesia; Phyllanthaceae.

Ano: 2016

URL: http://www.repository.naturalis.nl/record/620942

Nineteen new species and one new infraspecific name are proposed for the genus Guioa Cav. (Sapindaceae). If available, a leaflet, a petal (inside view), and a fruit were depicted.

Patterns in species richness and composition of plant families in the Malay Archipelago

Ano: 1988

URL: http://www.repository.naturalis.nl/record/525036

Welzen, P.C. van; Slik, J.W.F..

Distribution patterns or the recognition of phytogeographical areas is usually based on the presence and absence of species. The taxa on which the analyses are based remain virtually anonymous. Here we want to determine which Malesian plant families (within the sample) are responsible for species richness and composition patterns. The other aim is to determine whether the different islands groups in Southeast Asia can be grouped into separate phytogeographical areas. A Principal Coordinates Analysis (PCO) showed the presence of three phytogeographical areas within Malesia: The Sunda Shelf (Malay Peninsula, Sumatra, Borneo) in the west, the Sahul Shelf (New Guinea) in the east, and all remaining central areas forming Wallacea. The latter can be divided into...

Resurrection of Hancea and lectotypification of Adisca (Euphorbiaceae)

Palavras-chave: Floristic patterns; Malay Archipelago; Malesia; PCO; Plant families; Species richness.

Ano: 2009

URL: http://www.repository.naturalis.nl/record/525639

Sierra, S.E.C.; Kulju, K.K.M.; Veldkamp, J.F.; Welzen, P.C. van.

Based on phylogenetic studies with DNA sequence data, the formerly monotypic genus Cordemoya was recently expanded with 16 additional species previously assigned to Mallotus. However, the earliest legitimate generic name available is Hancea, and, therefore, Cordemoya is here reduced to Hancea (20 new combinations are proposed). Subsequently, the subgenus and section Diplochlamys from Asia are renamed to Hancea. Additionally, the genus Adisca is lectotypified with Adisca floribundus (= Mallotus floribundus).

Distribution maps of Pacific plants

Palavras-chave: Euphorbiaceae; Adisca; Cordemoya; Diplochlamys; Hancea; Mallotus; Madagascar; Malesia; Mascarenes.

Ano: 2007

URL: http://www.repository.naturalis.nl/record/525717

Balgooy, M.M.J. van; Lowry II, P.P.; Philipson, W.R.; Coode, M.J.E.; Nielsen, I.; Dransfield, J.; Meijden, R. van der; Schrader, T.; Adema, F.; Welzen, P.C. van.

Name: Alseuosmiaceae Airy Shaw, Kew Bull. 18 (1965) 249. Family: Alseuosmiaceae.

A revision of the Malesian species of Blachia (Euphorbiaceae)

Ano: 1993

URL: http://www.repository.naturalis.nl/record/509475

Malesia harbours one, possibly two species of Blachia. In the Philippines B. philippinensis is found and this species is not synonymous with B. andamanica. In literature B. andamanica has been recorded for west Malesia, but no specimens were seen. Based on its presence in Peninsular Thailand and the Andamans it is likely to be present in Peninsular Malaysia. The most distinct difference between both species is in the indumentum of the ovary, sparsely hairy in the lower half versus densely and completely sericeous, respectively.

Phylogenetic reconstruction prompts taxonomic changes in Sauropus, Synostemon and Breynia (Phyllanthaceae tribe Phyllantheae)

Palavras-chave: Blachia; Euphorbiaceae; Malesia.

Ano: 2015

URL: http://www.repository.naturalis.nl/record/578354

Welzen, P.C. van; Pruesapan, K.; Telford, I.R.H.; Esser, H.-J.; Bruhl, J.J..

Previous molecular phylogenetic studies indicated expansion of Breynia with inclusion of Sauropus s.str. (excluding Synostemon). The present study adds qualitative and quantitative morphological characters to molecular data to find more resolution and/or higher support for the subgroups within Breynia s.lat. However, the results show that combined molecular and morphological characters provide limited synergy. Morphology confirms and makes the infrageneric groups recognisable within Breynia s.lat. The status of the Sauropus androgynus complex is discussed. Nomenclatural changes of Sauropus species to Breynia are formalised. The genus Synostemon is reinstated.

A revision of the genus Dysolobium (Papilionaceae) and the transfer of subgenus Dolichovigna to Vigna

Palavras-chave: Breynia; Molecular phylogeny; Morphology; Phyllanthaceae; Sauropus; Synostemon.

Ano: 2014

URL: http://www.repository.naturalis.nl/record/525483

Welzen, P.C. van; Hengst, S. den.

Dysolobium is a small legume genus, consisting of 4 species. It is closely related to Vigna, from which it differs by the shape of the wing petals and by the velvety, almost woody pods. Recently the genus has been divided into 2 subgenera, but in this paper the subgenus Dolichovigna is transferred back to Vigna. Possible relations between Dysolobium and genera as Vigna, Phaseolus, Canavalia, Dolichos, Psophocarpus, and Pueraria are discussed. Vigna seems to be the most closely related genus. Dysolobium is a Southeast Asian genus, two species of which are endemic and two more widespread; one of the latter ranges from India to Java (not extending more eastwards). The plants prefer a climate with a seasonal drought. Vigna pilosa is the only species in Vigna...

Revision of the genera Aleurites, Reutealis and Vernicia (Euphorbiaceae)

Ano: 1985

URL: http://www.repository.naturalis.nl/record/526009

Stuppy, W.; Welzen, P.C. van; Klinratana, P.; Posa, M.C.T..

The three closely related genera Aleurites J. R. Forst. & G. Forst., Reutealis Airy Shaw and Vernicia Lour., together constituting the subtribe Aleuritinae of the tribe Aleuritideae (Euphorbiaceae subfamily Crotonoideae), are revised. Originally included in Aleurites, Reutealis and Vernicia are considered generically distinct on account of differences in the indumentum, leaf base, inflorescences, number of stamens and fruit type. This distinction has also been confirmed by a recent phylogenetic analysis. Aleurites (2 species) differs from Reutealis and Vernicia by the more numerous stamens arranged in 4 rather than in 2 whorls, and the indehiscent fruits. The monotypic genus Reutealis can easily be distinguished from Aleurites and Vernicia by its...

How to tackle revisions of large genera: lessons from Macaranga and Mallotus (Euphorbiaceae)

Palavras-chave: Aleurites; Reutealis; Vernicia; Malesia; Systematics; Taxonomy.

Ano: 1999

URL: http://www.repository.naturalis.nl/record/524645

Welzen, P.C. van; Kulju, K.K.M.; Sierra, S.E.C..

Two approaches to revise large genera are discussed. The first approach can be done by a single person, who revises the genus area after area. The other approach is by a team that revises per infrageneric taxon (preferably a single person per infrageneric group). The two approaches have their positive and negative sides, but both give good results. One problem with both approaches is to keep an overview of a possible infrageneric classification. The latter problem can be tackled by performing phylogenetic analyses based on molecular markers (providing core phylogeny) in combination with morphological, palynological, and anatomical data (providing apomorphies for infrageneric taxa).

Ficus cornelisiana, a new species of Ficus subsection Urostigma (Moraceae) from the Sino-himalayan region

Palavras-chave: Euphoriaceae; Macaranga; Mallotus; Phylogeny; Revision; Species rich genera.

Ano: 2009

URL: http://www.repository.naturalis.nl/record/524736

Chantarasuwan, B.; Peng, Y.-Q.; Baas, P.; Rasplus, J.-Y.; Heuven, B.-J. van; Welzen, P.C. van.

A small fig tree has been misidentified as Ficus orthoneura for a long time. However, morphologically it is distinct from F. orthoneura and F. hookeriana. Typical are the ellipsoid, puberulous receptacle and caducous basal bracts. Leaf anatomy shows a multiple epidermis with the cells in the inner layer much larger than in the outer layer and thus both layers resemble an epidermis with a separate hypodermis. The abaxial cuticle is strongly sculptured, the palisade layer shows some long subdivided cells, and enlarged lithocysts are only present abaxially. Because of these differences we hereby describe it as a new species, named in honour of Cornelis (Cees) Berg: Ficus cornelisiana.

Palavras-chave: China; Ficus; Moraceae; New species; Vietnam.

Ano: 2014

URL: http://www.repository.naturalis.nl/record/524854

Pandaceae

Pandaceae is a monophyletic group of three genera that was often regarded as part of the Euphorbiaceae, but of which molecular based phylogenies show it to be a distinct family. Malesia comprises two genera, Galearia (five species) and Microdesmis (two species) of which the taxonomic status, wood and pollen is discussed in a general way. The genus and species treatments contain descriptions, drawings, keys, distribution maps, and notes on habitat, ecology, uses, etc.

A revision of Jatropha (Euphorbiaceae) in Malesia

Ano: 2011

URL: http://www.repository.naturalis.nl/record/579371

Welzen, P.C. van; Sweet, F.S.T.; Fernández-Casas, F.J..

Jatropha, a widespread, species rich genus, ranges from the Americas and Caribbean to Africa and India. In Malesia five species occur, all of which were introduced and originated in Central and South America. The five species are revised and an identification key, nomenclature, descriptions, distributions, ecology, vernacular names, uses and notes are provided. Special attention is given to the uses of J. curcas, because it is steadily gaining popularity as a potential biofuel plant and, because of that, is being cultivated more often.