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| Duistermaat, Helena. |
| The subject of this thesis is a monograph of the genus Arctium, now including also five species formerly placed into Cousinia. Based on herbarium material and some field observations, this study presents new insights on three subjects: a) the generic delimitation of Arctium, b) the species delimitation within the A. minus-complex, and c) the occurrence of hybridisation. It soon became clear, rather surprisingly, that five species of Cousinia possess hooked involucral bracts like Arctium in its classical concept. The study became focussed then on the relation between Arctium in its classical delimitation and the large Asian genus Cousinia. From a macromorphological point of view the five ‘arctioid’ species of Cousinia should be placed in the extended genus... |
| Tipo: Article / Letter to the editor |
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| Ano: 1996 |
URL: http://www.repository.naturalis.nl/record/528199 |
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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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| Duistermaat, Helena. |
| In Malesia and Australia there are nine species of Oryza L. (Gramineae). Oryza meyeriana (Zoll. & Mor.) Baillon has two varieties. Oryza schlechteri Pilg. is only known from Irian Jaya (Indonesian New Guinea). Oryza australiensis Dom. and O. meridionalis Ng are endemic to Australia. The numerous forms of O. sativa L. have not been treated. Oryza rufipogon Griff., supposedly the wild progenitor of O. sativa, is considered as a distinct species. The name for the subfamily Oryzoideae is validated. |
| Tipo: Article / Letter to the editor |
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| Ano: 1987 |
URL: http://www.repository.naturalis.nl/record/525110 |
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