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| Registros recuperados: 63 | |
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| Adema, Frits; Prud’homme van Reine, Willem F.; Welzen, Peter van. |
| A large amount of unidentified material of the Neotropical genus Guatteria (Annonaceae) is lying on herbarium shelves around the world. Here twelve species are described in an attempt to reduce this amount of unidentified material. Next to this, previously unidentified material is now assigned to G. asplundiana, G. microcarpa, G. pastazae, and G. scalarinervia, four previously described but poorly known species, thus providing a clearer circumscription of these species. Furthermore, G. discolor and G. megalophylla appear to have a wider distribution than previously thought. Lastly, G. macrantha, a curious species only known from the type, is excluded from the genus and referred to Uvaria. With the description of twelve new species and the synonymizing of... |
| Tipo: Article / Letter to the editor |
Palavras-chave: Annonaceae; Guatteria; Neotropics; Bolivia; Brazil; Colombia; Ecuador; Peru. |
| Ano: 2008 |
URL: http://www.repository.naturalis.nl/record/525916 |
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| Adema, Frits. |
| A monograph of Cupaniopsis Radlk. (Sapindaceae) recognized. One species, is presented. Sixty species (20 new) are C. macrocarpa, is subdivided into two varieties (one new). Several regional keys and a multy-entry key give access to the species. Pollen morphology and leaf anatomy were studied beside macromorphology. This resulted in 40 characters for a cladistic analysis. The result of an initial analysis was rejected for several reasons (chapter 10.5). Van Welzen’s enhancement method was used to produce a more acceptable cladogram (chapter 10.6). A short note on the biogeography is given. |
| Tipo: Article / Letter to the editor |
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| Ano: 1991 |
URL: http://www.repository.naturalis.nl/record/508226 |
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| Valkenburg, Johan L.C.H. van; Balgooy, M.M.J. van; Lemaire, A.J.J.; Veldkamp, J.F.; Adema, Frits. |
| Sustainable forest management is more than limiting harvesting volume of timber in tall forest areas. Reclamation and restoration of depleted forest areas is gaining importance as areas of remaining tall forest are diminishing. Irrespective of the causal factors be it unsustainable logging, mining or forest fires, secondary forest resulting from these activities deserve special attention. In East Kalimantan a wide variety of trees has been used for reforestation of areas affected by the devastating fires of 1982- 1983. These attempts involved exotic as well as indigenous species, and results varied considerably. The 1998 fires that raged through the area sadly destroyed most of the successful trials. Gradually emphasis of reforestation has shifted towards... |
| Tipo: Article / Letter to the editor |
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| Ano: 2000 |
URL: http://www.repository.naturalis.nl/record/524576 |
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| Baas, Pieter; Adema, Frits. |
| Eleven October 2001 is the 80th birthday of Dr. Ding Hou, much appreciated Honorary Staff Member of our Nationaal Herbarium Nederland. Time to reflect on the life and career of this modest but highly productive and talented botanist. Ding Hou was born in 1921 in Hsingkan, Kiangsi Province, China. From 1941— 1945 he studied Botany for his BSc degree at the National Chung-Cheng University in Kiangsi, where he spent another two years as Botanical Assistant. From 1947- 1951 he held a similar position at the National Taiwan University in Taipei. He then moved to the United States of America where he earned an MA in Plant Taxonomy at the Washington University in St. Louis, Missouri in 1952, and his PhD on a revision of the genus Celastrus in 1955 under... |
| Tipo: Article / Letter to the editor |
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| Ano: 2001 |
URL: http://www.repository.naturalis.nl/record/524729 |
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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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| Registros recuperados: 63 | |
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