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| Registros recuperados: 14 | |
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| Geesink, R.. |
| Commercially available tree altimeters are expensive and heavy, and my personal experience with these instruments is thus minimal. During my last expedition I only used it now and then in the base camp to correct my ’feeling for estimation’. I have little doubt that colleagues will recognize these feelings. After my return I regretted this attitude to some extent and tried to design a cheap and light alternative device. It is drawn on the next page, and easy to construct: Make a copy of the drawing. Photocopies are generally not exact enough, causing differences to 5 m in this scheme, due to barrel- and cushionshaped distortion by the lens. I advise to copy the drawing by hand on transparent paper. Glue this copy (preferably with epoxy-resin to make it... |
| Tipo: Article / Letter to the editor |
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| Ano: 1982 |
URL: http://www.repository.naturalis.nl/record/533507 |
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| Geesink, R.. |
| In August 1972, Dr. W. J. J. O. de Wilde and his wife, Mrs. B. E. E. de Wilde-Duyfjes, collected on Mt. Bandahara in North Sumatra besides the already known Swertia piloglandulosa another, yet unknown Swertia which gave rise to this preliminary revision. This plant occurs together with S. piloglandulosa but inhabits a moister place in the mountain heath, viz. along a small streamlet, and it appeared to represent a miniature form of S. piloglandulosa. Besides, it had a further reduced number of ovules. It may be worthwhile to point out first the difference between dwarf forms and miniature forms. |
| Tipo: Article / Letter to the editor |
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| Ano: 1973 |
URL: http://www.repository.naturalis.nl/record/524595 |
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| Geesink, R.. |
| In the introduction a brief historical review is given of the more important earlier treatment of the genus. In chapter 2, covering morphological observations, I have also inserted remarks on the systematic value of certain features. The axillary (and in sect. Neossia, nodal) hairs have often been interpreted as representing stipules. I have tried to advance arguments in order to show that their stipular homology is most unlikely. It is confirmed that there is no essential difference between the morphological structure of the inflorescence and that of the vegetative portion of the plant. There is no unanimity of opinion about the interpretation of the 2-whorled perianth; the outer series is often accepted to be of a bracteal nature. Von Poellnitz refers to... |
| Tipo: Article / Letter to the editor |
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| Ano: 1969 |
URL: http://www.repository.naturalis.nl/record/525573 |
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| Geesink, R.. |
| Portulaca advena Reichg. & Von Poellnitz (1939), based on adventive specimens collected near Erp, prov. N.-Brabant, Netherlands, and afterwards cultivated in a garden at Nijmegen, appears to be identical with the South American P. papulosa Schldl. (1853). The adventive species of Portulaca found in the Netherlands can be distinguished as follows: 1. Calyx-segments distinctly keeled. Leaves flat, obovate to spathulate, with axillary hairs 0.1—0.8 mm long ............................. P. oleracea L. 1’. Calyx-segments not keeled. Leaves not flat but thick, linear to obovate, with axillary hairs c. 2—15 mm long. 2. Leaves (4—)7—18 mm long. Corolla violet. Seeds bluish grey. ..... P. pilosa L. 2’. Leaves 2—7 mm long. Corolla yellow. Seeds brown to black.... |
| Tipo: Article / Letter to the editor |
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| Ano: 1969 |
URL: http://www.repository.naturalis.nl/record/527245 |
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| Balgooy, M.M.J. van; Gunn, C.R.; Meijden, R. van der; Green, P.S.; Vogel, E.F. de; Geesink, R.; Hansen, B.; Carolin, R.C.; Kramer, K.U.; Hatorg, C. den; Manning, W.E.; Smit, P.G.; Wilde, W.J.J.O. de. |
| Name: Eurya Thunb., Nova Genera Plantarum (1783) 68. Family: Theaceae. |
| Tipo: Article / Letter to the editor |
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| Ano: 1975 |
URL: http://www.repository.naturalis.nl/record/509488 |
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| Geesink, R.. |
| The differentiating characters of Duabanga grandiflora (Roxb. ex DC.) Walp., D. moluccana Bl., and D. taylorii Jayaweera are given. Most characters of D. taylorii appear to be intermediate between those of the other two species; a few characters represent combinations of those of the two other species; one character is not shared by the other species. From this evidence it is supposed that D. taylorii is a hybrid. This suggestion is sustained by the history of the specimens on which D. taylorii is based. An attempt to count chromosomes of D. taylorii and D. grandiflora failed, probably due to the unsuitability of the fixative for this purpose. |
| Tipo: Article / Letter to the editor |
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| Ano: 1970 |
URL: http://www.repository.naturalis.nl/record/525056 |
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| George, A.S.; Kalkman, C.; Geesink, R.. |
| When Flora Malesiana began, officially in 1950, its aim was to produce a comprehensive survey of an estimated 25,000 plant species in a period of a few decades. On the one hand the Flora had to be concise, on the other hand it had to be “a replacing encyclopedia” for all previously published knowledge. The approach was generally called ‘semi-monographic’, indicating that a certain degree of ‘completeness’ was to be realized in the treatments. Even in 1960, ten years later, the founder, Professor van Steenis wrote in an official report that the period necessary for completion would be 30 years (from 1960 onwards) and that the total size would be equivalent to 20 volumes like volumes I, 4 and I, 5 that had appeared in the first decade. Had Professor van... |
| Tipo: Article / Letter to the editor |
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| Ano: 1989 |
URL: http://www.repository.naturalis.nl/record/533428 |
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| Lekkerkerk, R.W.; Vreeke, A.; Geesink, R.. |
| Seeds of all specimens of Montiafontana L. from several herbaria in the Netherlands were studied scanning electron microscopically. Four main seed types could be recognised (fig. 1,2), corresponding with the types often used for dividing the M. fontana complex in species, subspecies or varieties. These main types are connected by intermediates and together they form a series of gradual variation. No other characters could be found that show a correlation with the seed types. Hence the authors refrain from a formal infraspecific subdivision of M. fontana. |
| Tipo: Article / Letter to the editor |
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| Ano: 1983 |
URL: http://www.repository.naturalis.nl/record/527653 |
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| Geesink, R.. |
| Annual to perennial, erect or creeping, mostly branched herbs or shrubs, occasionally woody at the base, often with a tuberous or swollen main root, occasionally rooting at the nodes. Leaves spirally arranged to opposite, subsessile, occasionally with axillary hairs or scales (in Mal. only in Portulaca), nervation pinnate or reticulate. Flowers bisexual, actinomorphous (occasionally cleistogamous), in axillary and/or terminal thyrsi, dichasia, in terminal capitules or solitary (terminal or axillary). Bracts leaf-like or membranous. Sepals 2 (4-8 in extra-Mal. Lewisia and Grahamia), boat-shaped, deltoid to obovate at base shortly connate and confluent with petals and stamens. Petals (3-)4-6(-8), mostly obovate and unequal, shortly connate. Stamens (l-)3-∞,... |
| Tipo: Article / Letter to the editor |
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| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/532638 |
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| Bourdy, G.; Veldkamp, J.F.; Baas, P.; Veldkamp, J.F.; Veldkamp, J.F.; Steenis, C.G.G.J. van; Noteboom, H.P.; Kramer, K.U.; Veldkamp, J.F.; Balgooy, M.M.J. van; Noteboom, H.P.; Noteboom, H.P.; Geesink, R.; Steenis, C.G.G.J. van; Veldkamp, J.F.; boom, H.P. Noote-; Steenis, C.G.G.J. van; Noteboom, H.P.; Steenis, C.G.G.J. van; Steenis, C.G.G.J. van; Noteboom, H.P.. |
| BOURDY, G. Une approche de la médicine traditionnelle à Bukittinggi (Sumatra Quest). D.E.A. d’ecologie U.S.T.L. Montpellier. 1984. 55 pp. The results presented in this paper are based one some field work conducted in the Minangkabau region of Bukittinggi (Western Sumatra) during February and March 1984. Traditional medicine is approached through the description of medicinal plants, the way they are utilized, and the people who gather and prescribe them. Data have been collected while interviewing the ’dukuns’ (native doctors). For each medicinal plant synonyms, vernacular names in Bahasa and Minangkabau are given. Voucher specimens of 69 specimens of such medicinal plants were collected and are deposited at MPU. |
| Tipo: Article / Letter to the editor |
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| Ano: 1985 |
URL: http://www.repository.naturalis.nl/record/533443 |
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| Geesink, R.; Leeuwenberg, A.J.M.; Ridsdale, C.E.; Veldkamp, J.F.. |
| For the identification of a flowering plant the first step usually is to discover to which family it belongs. With some experience, the families commonly encountered in one’s area of interest are soon known, but when dealing with specimens from other places, notably those from the vast and rich subtropics and tropics, there is much less certainty. The pertinent literature is often not readily available as it is often found only in expensive, rare or obscure books, or journals, present only in a few specialized institutes. Basically only a few keys to the families of flowering plants of the world have ever been produced, the best known of which at present is Hutchinson’s Key to the families of flowering plants (1973); less well-known are Lemée’s Tableau... |
| Tipo: Article / Letter to the editor |
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| Ano: 1981 |
URL: http://www.repository.naturalis.nl/record/508216 |
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| Geesink, R.. |
| During the preparation of his ‘Illustrated Mountain Flora of Java’, Dr. van Steenis came upon some specimens of Swertia from North Sumatra, which he had collected himself on his expedition in the Gaju and Alas Lands. He could not place these specimens in the known Malesian species and gave them to me for further examination. They proved to represent two new species which both belong to section Ophelia C. B. Clarke. All cited specimens are located in the Rijksherbarium, Leiden. I am very thankful to Dr. H. O. Sleumer, who translated the diagnoses into Latin. |
| Tipo: Article / Letter to the editor |
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| Ano: 1972 |
URL: http://www.repository.naturalis.nl/record/526043 |
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| Haas, A.J.P. de; Bosman, M.T.M.; Geesink, R.. |
| The monotypic genus Urariopsis, based on Uraria cordifolia Wall., has been compared with several S.E. Asiatic species of Uraria. The species Uraria prunellaefolia, U. collettii, and U. barbata are considered to be most closely related to U. cordifolia. The pods of U. cordifolia and U. collettii consist of longitudinally flattened, peltate loments, those of U. prunellaefolia consist of laterally flattened, longitudinally arranged loments; in the other species the loments are laterally flattened and zig-zag folded. No correlating characters were found, and the differences in shape of the pods are not considered sufficient ground to distinguish groups on generic level. Notes on morphology, nomenclature, and geographic distribution are presented. |
| Tipo: Article / Letter to the editor |
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| Ano: 1980 |
URL: http://www.repository.naturalis.nl/record/524609 |
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| Registros recuperados: 14 | |
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