Prof.dr. P.C. van Welzen
Extra-ordinary professor Tropical Plant Biogeography, chair endowed by TREUB
- Contact information
Tel: +31 (0) 71 527 3571
Fax: +31 (0) 71 527 3522
E-mail: .(JavaScript must be enabled to view this email address)
- Main research interests
Key-words: Malesia, Euphorbiaceae, Sapindaceae, Phylogeny, Biogeography
- Revision work (species distinction, classification, identification keys) of Malesian and Thai Euphorbiaceae and Sapindaceae. Creation of a research group.
- Phylogenetic analyses of groups in Euphorbiaceae based on molecular and/or morphological data.
- Biogeographical patterns in Malesia, historical biogeography of Malesian taxa.Main national and international partners:
Barker, C. Revision of Malesian species of Flueggea (Euphorbiaceae). Kew, UK.
Bruhl, J. Cooperation phylogeny of Sauropus and allies (Euphorbiaceae). Australia.
Chayamarit, K. Revisions of families for Flora of Thailand project. Bangkok, Thailand
Davies, S. Macaranga (Euphorbiaceae). Harvard, USA.
Djarwaningsih, T. Revisions of Malesian Euphorbiaceae. Bogor, Indonesia.
Dressler, S. Revision of Bridelia (Euphorbiaceae). Senckenberg, Frankfurt, Germany.
Esser, H.-J. Revisions of various genera of Euphorbiaceae. Munich, Germany.
Fernandez Casas, J. Revision of Jatropha (Euphorbiaceae). Madrid, Spain.
Fiala, B. Macaranga and Mallotus (Euphorbiaceae). Germany.
Forster, P. DNA samples, revisions of small genera. Queensland, Australia.
Gillespie, L.J. Revision of climbing Malesian Euphorbiaceae genera. Canadian Museum of Nature.
Hoffmann, P. Revision of Antidesma, Actephila (Euphorbiaceae). Kew, UK.
Levin, G.A.K. Phylogeny of Acalypha (Euphorbiaceae). Illinois Natural History Survey, USA.
Parnell, J. Biogeographical patterns in Thailand. Trinity College, Dublin, Ireland
Phattarahirankanok, K. Assistence work in Thailand. Bangkok, Thailand.
Phuphatahanaphong, L. Assistence work in Thailand. Bangkok, Thailand.
Pooma, R. Assistence work in Thailand. Bangkok, Thailand.
Radcliffe Smith, A. Classification Euphorbiaceae. Kew, UK.
Sagun, V. Revision of Acalypha (Euphorbiaceae). Illinois Natural History Survey, USA.
Simpson, D. Biogeographical patterns in Thailand. Kew, UK.
Telford, I. Sauropus (Euphorbiaceae). Environmental Sciences and Natural Resources Management, Armidale, NSW, Australia.
Thin, N.N. Cooperation Vietnamese Euphorbiaceae. Hanoi, Vietnam.
Wurdack, K.J. Molecular classification of Euphorbiaceae. Smithsonian, Washington DC, USA.
- Publications
Welzen, P.C. van. 1981. A taxonomic revision of the genus Arthraxon Beauv. (Gramineae). Blumea 27: 255—300.
Welzen, P.C. van & P. Baas. 1984. A leaf anatomical contribution to the classification of the Linaceae complex. Blumea 29: 453—479.
Welzen, P.C. van & S. den Hengst. 1984. The genus Mastersia (Papilionaceae: Phaseoleae). Blumea 30: 77—87.
Welzen, P.C. van & S. den Hengst. 1985. A revision of the genus Dysolobium (Papilionaceae) and the transfer of the subgenus Dolichovigna to Vigna. Blumea 30: 363—383.
Welzen, P.C. van. 1988. Key to the Malesian genera of Sapindaceae. Blumea 33: 215—237.
Welzen, P.C. van. 1988. Nineteen new species and a new combination in Guioa Cav. (Sapindaceae). Blumea 33: 411—421.
Welzen, P.C. van. 1989. Guioa Cav. (Sapindaceae): Taxonomy, Phylogeny, and Historical Biogeography. Leiden Botanical Series 12: 1—315.
Welzen, P.C. van. 1989. Software programs COOR and MAP. Taxon 38: 237.
Welzen, P.C. van. 1991. Gloeocarpus Radlk. (Sapindaceae) revised. Blumea 35: 389—392.
Welzen, P.C. van. 1991. The Malesian species of Sarcopteryx Radlk. (Sapindaceae). Blumea 36: 87—103.
Welzen, P.C. van. 1992. Interpretation of historical biogeographic results. Acta Bot. Neerl. 41: 75—87.
Welzen, P.C. van, P. Piskaut & F.I. Windadri. 1992. Lepidopetalum Blume (Sapindaceae): Taxonomy, phylogeny, and historical biogeography. Blumea 36: 439—465.
Jarvie, J. & P.C. van Welzen. 1994. What are tropical floras for in S.E. Asia? Taxon 43: 444—448.
Welzen, P.C. van. 1994. Taxonomy, phylogeny, and biogeography of Neoscortechinia Hook.f. ex Pax (Euphorbiaceae). Blumea 39: 301—320.
Welzen, P.C. van, L.J. Bulalacao & Tran Van On. 1995. A taxonomic revision of the Malesian genus Trigonopleura Hook.f. (Euphorbiaceae). Blumea 40: 363—374.
Welzen, P.C. van. 1995. Taxonomy and Phylogeny of the Euphorbiaceae Tribe Erismantheae G.L.Webster (Erismanthus, Moultonianthus, and Syndyophyllum). Blumea 40: 375—396.
Welzen, P.C. van. 1997. Paraphyletic groups or what should a classification entail. Taxon 46: 99—103.
Repetur, C.P., P.C. van Welzen & E.F. de Vogel. 1997. Phylogeny and historical biogeography of the genus Bromheadia (Orchidaceae). Syst. Bot. 22: 465—477.
Esser, H.-J., P.C. van Welzen & T. Djarwaningsih. 1998. A phylogenetic classification of the Malesian Hippomaneae (Euphorbiaceae). Syst. Bot. 22: 617—628.
Welzen, P.C. van. 1998. Revisions and phylogenies of Malesian Euphorbiaceae: Subtribe Lasiococcinae (Homonoia, Lasiococca, Spathiostemon) and Clonostylis, Ricinus, and Wetria. Blumea 43: 131—164.
Welzen, P.C. van. 1998. Phylogenetic versus Linnaean taxonomy, the continuing story. Taxon 47: 413—423.
Nguyen Nghia Thin, Vu Hoai Duc, & P.C. van Welzen. 1998. A revision of the Indochinese-Malesian genus Strophioblachia (Euphorbiaceae). Blumea 43: 479-487.
Stuppy, W., P.C. van Welzen, P. Klinratana & M.C.T. Posa. 1999. Revision of the genera Aleurites, Reutealis, and Vernicia (Euphorbiaceae). Blumea 44: 73—98.
Forster, P.I. & P.C. van Welzen. 1999. The Malesian species of Choriceras, Fontainea, and Petalostigma (Euphorbiaceae). Blumea 44: 99—107.
Welzen, P.C. van. 1999. Revision and phylogeneny of subtribes Chrozophorinae and Doryxylinae (Euphorbiaceae) in Malesia and Thailand. Blumea 44: 411—436.
Welzen, P.C. van, Kartika Ning Tyas, Eviyarni, & F.J.M. Gaerlan. 1999. The Malesian species of Melanolepis (Euphorbiaceae). Blumea 44: 437—446.
Welzen, P.C. van & W. Stuppy. 1999. Phylogenetic considerations of Euphorbiaceae tribe Aleuritideae. Ann. Missouri Bot. Gard. 86: 894—903.
Slik, J.W.F., Priyono & P.C. van Welzen. 2000. Key to the Macaranga Thou. and Mallotus Lour. species (Euphorbiaceae) of East Kalimantan, Indonesia. Gard. Bull. Singapore 52: 11—87.
Bollendorff, S.M., P.C. van Welzen & J.W.F. Slik. 2000. A taxonomic revision of Mallotus section Polyadenii (Euphorbiaceae). Blumea 45: 319—340.
Slik, J.W.F. & P.C. van Welzen. 2001. A taxonomic revision of Mallotus sections Hancea and Stylanthus (Euphorbiaceae). Blumea 46: 3—66.
Welzen, P.C van & K. Phattarahirankanok. 2001. Mallotus kongkandae (Euphorbiaceae), a new species from Thailand. Blumea 46: 67—69.
Sevilla, S. & P.C. van Welzen. 2001. Revision and phylogeny of Agrostistachys and Chondrostylis (Euphorbiaceae). Blumea 46: 71—97.
Turner, H., P. Hovenkamp & P.C. van Welzen. 2001. Biogeography of Southeast Asia and the Pacific. J. Biogeogr. 28: 217—230.
Welzen, P.C. van. 2001. Two new species of Sauropus (Euphorbiaceae) from Thailand and a new combination. Blumea 46: 499—504.
Welzen, P.C. van, H. Turner & M.C. Roos. 2001. New Guinea: A correlation between accreting areas and dispersing Sapindaceae. Cladistics 17: 242—247.
Slik, J.W.F. & P.C. van Welzen. 2001. A phylogeny of Mallotus (Euphorbiaceae) based on morphology: Indications for a pioneer origin of Macaranga. Syst. Bot. 26: 786—796.
Sagun, V.G. & P.C. van Welzen. 2002. Revision of the Malesian species of Micrococca (Euphorbiaceae). Blumea 47: 149—155.
Welzen, P.C., H. Turner & P. Hovenkamp. 2003. Historical biogeography of Southeast Asia and the West Pacific, or the generality of unrooted area networks as historical biogeographic hypotheses. J. Biogeogr. 30: 181—192.
Buijsen, J.R.M., P.C. van Welzen & R.W.J.M. van der Ham. 2003. A phylogenetic analysis of Harpullia (Sapindaceae) with notes on historical biogeography. Syst. Bot. 28: 106—117.
Welzen, P.C. van. 2003. A revision of the Malesian and Thai species of Sauropus (Euphorbiaceae: Phyllanthoideae). Blumea 48: 319—391.
Hoang Van Sam & P.C. van Welzen. 2004. Revision of Annesijoa, Elateriospermum and the introduced species of Hevea in Malesia (Euphorbiaceae). Blumea 49: 425—440.
Kulju, K.K.M. & P.C. van Welzen. 2005. Revision of the genus Cleidion (Euphorbiaceae) in Malesia. Blumea 50: 197—219.
Sierra, S.E.C., P.C. van Welzen & J.W.F. Slik. 2005. A taxonomic revision of Mallotus section Philippinensis (former section Rottlera – Euphorbiaceae) in Malesia and Thailand. Blumea 50: 221—248.
Sierra, S.E.C. & P.C. van Welzen. 2005. A taxonomic revision of Mallotus section Mallotus (Euphorbiaceae) in Malesia. Blumea 50: 249—274.
Welzen, P.C. van & S.E.C. Sierra. 2005. Lasiococca brevipes (Euphorbiaceae): a new combination. Blumea 50: 275—277.
Sierra, S.E.C. & P.C. van Welzen. 2006. Mallotus kongkandae (Euphorbiaceae): New record for China. Blumea 51: 365—366.
Welzen, P.C. van & S.E.C. Sierra. 2006. The Mallotus wrayi complex (Euphorbiaceae). Blumea 51: 373—388.
Welzen, P.C. van, S.E.C. Sierra, M.J.H. Gebraad & K.K.M. Kulju. 2006. The distinction of five Mallotus species formerly in section Hancea (Euphorbiaceae). Blumea 51: 367—372.
Sierra, S.E.C., M. Aparicio, K.K.M. Kulju, Ž. Fišer, P.C. van Welzen & R.W.J.M. van der Ham. 2006. Re-shaping Mallotus [Part 1]: Expanded circumscription and revision of the genus Cordemoya (Euphorbiaceae). Blumea 51: 519—540.
Sierra, S.E.C., M. Aparicio, M.J.H. Gebraad, K.K.M. Kulju & P.C. van Welzen. 2007. The morphological range in Mallotus and a taxonomic revision of its section Rottleropsis (including Axenfeldia) in Malesia, Thailand and Africa. Blumea 52: 21-113.
Kulju, K.K.M., S.E.C Sierra & P.C. van Welzen. 2007. Re-shaping Mallotus [Part 2]: Inclusion of Neotrewia, Octospermum and Trewia to Mallotus s.s. (Euhporbiaceae s.s.). Blumea 52: 115-136.
Kulju, K.K.M., S.E.C. Sierra, S.G.A. Draisma, R. Samuel & P.C. van Welzen. 2007. Molecular phylogeny of Macaranga, Mallotus, and related genera (Euphorbiaceae s.s.): insights from plastid and nuclear DNA sequence data. Amer. J. Bot. 94: 1726—1743.
Sierra, S.E.C., K.K.M. Kulju, J.F. Veldkamp & P.C. van Welzen. 2007. Resurrection of Hancea and lectotypification of Adisca (Euphorbiaceae). Blumea 52: 361—366.
Welzen, P.C. van & L.J. Bulalacao. 2007. The genus Alchornea (Euphorbiaceae) in the Malay Archipelago and Thailand. Syst. Bot. 32: 803—818.
Kabouw, P., P.C. van Welzen, P. Baas & B.J. van Heuven. 2008. Styloid crystals in Claoxylon (Euphorbiaceae) and allies (Claoxylinae) with notes on leaf anatomy. Bot. J. Linn. Soc. 156: 445—457.
Willemse, L.P.M., P.C. van Welzen & J.B. Mols. 2008. Standardisation in data-entry acroos databases: avoiding Babylonian confusion. Taxon 57: 343—345.
Pruesapan, K., I.R.H. Telford, J.J. Bruhl, S.G.A. Draisma & P.C. van Welzen. 2008. Delimitation of Sauropus (Phyllanthaceae) based on Plastid matK and Nuclear Ribosomal ITS DNA Sequence Data. Ann. Bot. 102: 1007—1018.
Kulju, K.M. & P.C. van Welzen. 2008. (1855) Proposal to conserve the name Mallotus against Trevia (“Trewia”) (Euphorbiaceae s.str.). Taxon 57: 1359—1360.
- Other relevant information
2005 till present: Scientific board Flora of Thailand Project.
2005 till present: Editor of Flora of Thailand.
