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| Registros recuperados: 23 | |
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| Jonker, F.P.. |
| In 1935 the present author reported the occurrence of this N. American species in the eastern part of Holland, province of Overijssel, in the vicinity of Almelo (JONKER, 1935). He found the species near the hamlet of Harbrinkhoek on a wet heath. The locality was also the only station of Wahlenbergia hederacea in the Netherlands, discovered a year before. Notwithstanding the extensive reclamations in that part of the country the species now still occurs in a number of localities around Almelo. The plants cannot be considered adventitious as they were found in places that are comparatively little influenced by human culture, judging from the occurrence, on the first-discovered locality, of e.g. Wahlenbergia hederacea. Gentiana pneumonanthe, Viola palustris,... |
| Tipo: Article / Letter to the editor |
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| Ano: 1959 |
URL: http://www.repository.naturalis.nl/record/535009 |
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| Jonker, F.P.. |
| The peculiar distribution of the species of Rhizophora (Rhizophoraceae) is wellknown. Floras and manuals usually mention one western species — R. mangle L. — that occurs both in the coastal regions of tropical and subtropical America and in the corresponding habitats of west tropical Africa, and an eastern species — R. mucronata Lam. — occurring both in tropical Asia and in east tropical Africa. It is also well-known that a few other species occur in tropical Asia; a recent revision has been given by HOU (1958). G. F. W. MEYER (1818) described from British Guiana a second American species, R. racemosa, differing in the inflorescence which is forked and 2-flowered in R. mangle and much-branched in R. racemosa. ENGLER (1876) regarded this species as a... |
| Tipo: Article / Letter to the editor |
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| Ano: 1959 |
URL: http://www.repository.naturalis.nl/record/534985 |
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| Burgh, J. van der; Jonker, F.P.; Bunnik, F.P.M.; Landsmeer, D.. |
| The discovery of two localities of Cornus mas in the farthest south of the Netherlands induced the authors to study the distribution of the species in Northwest Europe. They arrived at the conclusion that the species is indigenous in the Netherlands, in the southern part of the calcareous district i.e. the uttermost south of the province of Limburg. A line running diagonally through Belgium from the Straits of Dover to Maastricht; in the Netherlands from Maastricht to Aachen and in Germany from Aachen to Gottingen is considered to be the northern boundary of the species area in Western Europe. |
| Tipo: Article / Letter to the editor |
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| Ano: 1983 |
URL: http://www.repository.naturalis.nl/record/528048 |
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| Jonker, F.P.. |
| A description is given of the history of the development of palynology in The Netherlands. This development is traced from the appearance in 1777-1779 of the book Katechismus der Natuur by J. F. Martinet, through the increased interest, begun in the 1920’s with the appearance of a thesis by Miss B. Polak on the investigation of peat bogs in the western Netherlands, to the culmination with the establishment of palynological divisions in several universities and other institutions in The Netherlands. |
| Tipo: Article / Letter to the editor |
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| Ano: 1967 |
URL: http://www.repository.naturalis.nl/record/534838 |
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| Jonker-Verhoef, A.M.E.; Jonker, F.P.. |
| After the publication of the Araceae in the Flora of Suriname 1.2 (1953), p. 1-80, a number of rare and new species have been collected. Some of these were collected by Dr. J. Lindeman between 1953 and 1955, the remaining by the present authors, who visited Suriname from November, 1955, to March, 1956. Field observations by the authors clearly indicated the fragmentary status of our knowledge of Suriname Aroids. The reasons for this are to be sought in the difficulties involved in collecting and preserving. Also, a number of species may not flower over a period of several years. The inflorescences of many lianas are often almost inaccessible. A source of confusion is the variability in the leaves of a species. The following is an enumeration of species... |
| Tipo: Article / Letter to the editor |
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| Ano: 1959 |
URL: http://www.repository.naturalis.nl/record/534857 |
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| Jonker-Verhoef, A.M.E.; Jonker, F.P.. |
| The list of Araceae published in 1906 by A. A. PULLE in his “Enumeration of the Vascular Plants known from Surinam” comprises 39 species belonging to 14 genera, the largest genera being Anthurium with 7 species and Philodendron with 12 species. It was found that one of these 39 species was included by mistake, for the specimen Wullschlaegel n. 1764, which is the type of Spathiphyllum blandum Schott, was erroneously assumed to have been collected in Suriname. Already in 1908 TRESLING had collected a species that was not listed by PULLE, viz. Dieffenbachia picta (Lodd.) Schott. |
| Tipo: Article / Letter to the editor |
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| Ano: 1953 |
URL: http://www.repository.naturalis.nl/record/534932 |
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| Jonker-Verhoff, A.M.E.; Jonker, F.P.. |
| The list of Marantaceae published by PULLE (1906) comprises 20 species belonging to 6 genera, the largest genus being Calathea with 8 species. It was found, however, that one of the species does not belong to the family: investigation of the type of Calathea strobilifera (Miq.) Koern., viz. Kegel 1469 [GOET], showed that it pertains to Renealmia strobilifera Poepp. et Endl. (Zingiberaceae). The record of another species, Calathea allouia (Aubl.) Lindl. appeared to be based on a misidentification: the collection Focke 893 cited under this name by PULLE (1906) belongs to C. grandis O. G. Peters. Later on PULLE (1909) recorded the occurrence of one species more of this family in Suriname, viz. Myrosma polystachya Pulle, a new species. Since then no further... |
| Tipo: Article / Letter to the editor |
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| Ano: 1956 |
URL: http://www.repository.naturalis.nl/record/534947 |
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| Jonker, F.P.. |
| The present publication is intended to be a monograph on the family of Burmanniaceae. It is divided into three parts: General Part, Critical Part and Taxonomical Part. The first part, General Part, contains general remarks on the taxonomy, distribution and use of the family. The second part, Critical Part, contains general and geobotanical remarks on the genera of the family, whereas the third part, the Taxonomical Part, gives the determination keys to the tribes, subtribes, genera, sections, subsections and species, the description of these groups with literature, distribution and the indications of the types. New varieties, species and larger groups are described in the taxonomical part in foot-notes. |
| Tipo: Article / Letter to the editor |
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| Ano: 1938 |
URL: http://www.repository.naturalis.nl/record/534971 |
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| Jonker, F.P.. |
| Annual or perennial, saprophytic or autotrophic herbs; the saprophytic species often colourless. Leaves usually spread or alternate, entire, simple, without stipules; non-saprophytic species with a radical rosette of linear leaves; stem leaves often reduced to small scales; sometimes the basal part of the stem provided with many decurrent, grass-like leaves. Flowers ♀♂, usually actinomorphic, solitary or in capitate or cymose inflorescences. Perianth corolline; limb consisting of 2 whorls; tube sometimes 3-winged. Anthers 3, subsessile in the perianth throat and dehiscing laterally with horizontal slits,or 6, hanging down in the perianth tube and dehiscing with longitudinal slits. Connective large, often appendiculate. Style filiform or shortly cylindrical... |
| Tipo: Article / Letter to the editor |
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| Ano: 1948 |
URL: http://www.repository.naturalis.nl/record/532648 |
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| Jonker, F.P.; Wensink, J.J.. |
| An account is given of a scientific expedition to the Emma Range in Dutch Guiana. The expedition left on 10 July 1959 from Paramaribo, and after five days reached the base camp on the Toekoemoetoe creek, a tributary of the upper Saramacca River. From here the expedition proceeded by foot to the Emma Range. The main camp was situated at the foot of the range, at a height of 325 m. Two subsidary camps were set up at the north and south of the range respectively. On the 28th October the expedition returned to Paramaribo. |
| Tipo: Article / Letter to the editor |
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| Ano: 1960 |
URL: http://www.repository.naturalis.nl/record/534744 |
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| Florschütz, F.; Jonker, F.P.. |
| The post-Glacial history of the forests in the Netherlands has been reconstructed fairly well by pollen analysis of several bogs. At the same time stratigraphical investigations shed some light on the way in which these bogs had been built up, i.e. on the plants by which, in the various forest periods, peat was formed. Though these data are quite interesting, they do not give a good impression of the entire synchronal herbaceous flora, as they are limited to the peatbuilding plants. As yet very little is known of the rest of the vegetation (water-, marsh- and land-plants) of the late-Pleistocene and Holocene periods. We must look for their remains in other deposits, particularly in clay and sand, wherein however few land plants will be found, as their... |
| Tipo: Article / Letter to the editor |
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| Ano: 1940 |
URL: http://www.repository.naturalis.nl/record/535238 |
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| Jonker, F.P.. |
| In the previous volume of this periodical the present author reported on the occurrence of Hypericum canadense L. in the Netherlands, together with that in a similar locality in Ireland and in a more deviating locality in France, discovered by WEBB and by BOUCHARD respectively. Dr. C. SIMON of Basel, Switzerland, was so kind to send dried material of two collections from the French locality, collected by him on August 17th, 1958, and August 20th, 1959 (Haute Saône, at the beach of a lake in the region of the Etang d’Arfin, near La Mer, alt. 540 m). This material, however, appeared to belong to another species, though related to H. canadense, namely, Hypericum majus (A. Gray) Britt. Dr. Simon himself arrived already at the same conclusion, which, according... |
| Tipo: Article / Letter to the editor |
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| Ano: 1960 |
URL: http://www.repository.naturalis.nl/record/535131 |
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| Jonker, F.P.. |
| Herba pusilla, saprophytiea, 10—13 cm alta. Radices ignotae. Caulis simplex, erectus, teres, glaber, succulentus. Folia 3—8, squamas simulantia, lanceolata vel ovato-lanceolata, glabra, acuta vel acuminata, 2—6 mm longa, uninervia, nervo prominente. Folia basalia rosulata nulla. Bracteae plm. 5 mm longae, ovatae, acutae. Flores 5—9, albi-purpurascentes, 9— 12 mm longi, erecti, pedicellati, in cincinnos geminos conferti. Limbus succulentus, 6-lobatus, lobis exterioribus tribus, 1.5—2 mm longis, erectis, in alabastris et floribus junioribus margine involutis, triangularibus, obtusis; in floribus perfectis orbiculatis et margine evolutis; lobis interioribus erectis, crassis, glandulosis, ovatis vel obovatis vel orbiculatis, obtusis vel rotundatis vel retusis,... |
| Tipo: Article / Letter to the editor |
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| Ano: 1938 |
URL: http://www.repository.naturalis.nl/record/525423 |
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| Jonker, F.P.. |
| An outline of the possible homologies of the calyx and corolla of the Lesser Celandine on the hand of the flower morphology of both Anemone and Hepatica, and Ranunculus is given. The possible affinities of the species are discussed. The author defends a homology of its calyx to that of Hepatica and to the involucre of Anemone, and, at the same time, a homology of its corolla to that of Ranunculus and to the nectaries in a number of other genera of Ranunculaceae. The author rejects a placing of the species in the genus Ranunculus (as R. ficaria L.) and is in favour of a placing in the genus Ficaria (F. verna Huds.). Pollenmorphological data are, more or less in accordance with this view. |
| Tipo: Article / Letter to the editor |
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| Ano: 1971 |
URL: http://www.repository.naturalis.nl/record/527717 |
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| Jonker, F.P.. |
| En 1894, H. Baillon (Bull. Mens, de la Soc. Linn. de Paris II, p. 1149) décrit une nouvelle plante de Madagascar, Geosiris aphylla, qui d’après sa couleur et son aspect général faisait penser à la famille des Burmanniacées. Mais, comme il remarquait, non seulement que les 3 anthères ne se conformaient pas à celles des Burmanniacées dans leur forme, les anthères sont superposées aux sépales et non aux pétales ainsi qu’en est le cas chez les Burmanniacées qui possèdent 3 étamines. Selon la forme et selon la place des étamines Baillon pensait alors avoir à faire avec une représentante de la famille des Iridacées dépourvue de chlorophylle. La construction des fleurs et surtout celle du gynécée se rapprochent le plus fortement au groupe d’ Aristea et ses... |
| Tipo: Article / Letter to the editor |
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| Ano: 1939 |
URL: http://www.repository.naturalis.nl/record/535224 |
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| Florschütz, F.; Jonker, F.P.. |
| Die Pflanzendecke unseres Landes hat während des Quartärs grosse Änderungen erlitten. Dies wird besonders deutlich beim Vergleich der limburgischen fossilen Flora, wie sie in einer vortrefflichen Arbeit des Ehepaares REID (Lit. 1) beschrieben ist, mit der gegenwärtig einheimischen Vegetation. Im allgemeinen wird die erwähnte Flora für jungtertiär gehalten, jedoch ist ihre Stelle im Pliozän umstritten. Von den ungefähr 240 Phanerogamen, von welchen sich Reste im Ton von Reuver, Swalmen und Brunssum vorfanden, sind laut der Berechnung von E. M. REID nur 12% heute indigen und 88% exotisch; mehr als die Hälfte der letzteren sind identisch mit rezenten sino-amerikanischen Arten (Lit. 2). |
| Tipo: Article / Letter to the editor |
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| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/535109 |
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| Jonker, F.P.. |
| Though an excellent, critical monograph of the genus Cassipourea was published some years ago by ALSTON (in Kew Bulletin, 1925, p. 241—276), I should like to make a few remarks on the South-American species of this genus as my revision for PULLE’s Flora of Suriname III.2 has brought to light a few new facts. It will also give me an opportunity to refer to a publication of BRIQUET on some American representatives of this genus (in Candollea IV, 1931, p. 342—350), which disagrees with regard to a number of species with ALSTON’s interpretations. The species which covers the largest area is the chiefly West-Indian C. elliptica (Sw.) Poir. Formerly also a number of West- Brazilian and Peruvian specimens were referred to it, but ALSTON pointed out that these... |
| Tipo: Article / Letter to the editor |
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| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/534887 |
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| Jonker, F.P.. |
| Misschien wel het meest gecompliceerde probleem van de vele waarvoor een nieuw benoemde hoogleraar zich geplaatst voelt, is het onderwerp van zijn oratie. Binnen de wetenschap, die hij voortaan in de kringen van zijn universiteit mag uitdragen, zijn uiteraard tal van vraagstukken het onderwerp van actuele discussies, en een aantal van deze problemen zal zijn warme belangstelling hebben. Dikwijls zal hij partij gekozen hebben in een aantal strijdvragen en het ligt voor de hand dat de verleiding groot is om de gelegenheid van zijn inaugurele rede aan te grijpen en zijn standpunt met klem van argumenten uiteen te zetten. |
| Tipo: Article / Letter to the editor |
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| Ano: 1960 |
URL: http://www.repository.naturalis.nl/record/534995 |
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| Jonker, F.P.. |
| Of the family Oenotheraceae the genus Jussieua is the only one occurring in Suriname. The peculiar Oocarpon torulosum (Arn.) Urb., which has been recorded from Amazonian Peru, Brazil, British and French Guiana, Cuba and Santo Domingo, has up till now not been collected in the colony, but on account of its presence in the neighbouring countries it is there also to be expected. As for the name of the only Suriname genus, it was spelled by LINNAEUS in Genera Plantarum, ed. I (1737), p. 126, Jussieua but afterwards in his Flora Zeylanica (1747), p. 75, changed in Jussiaea. |
| Tipo: Article / Letter to the editor |
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| Ano: 1942 |
URL: http://www.repository.naturalis.nl/record/535162 |
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| Donselaar, J. van; Jonker, F.P.. |
| Up till now the lower deposits of peat (in Dutch: veen-op-groterediepte = peat at greater depth) have been investigated in the Netherlands mainly in the Western part of the country, viz. in the provinces of Noord-Holland, Zuid-Holland and Zeeland. The analyses have shown that the development of this, now comparatively well known peat layer must have begun either in the second half of the boreal period or else in the beginning of the atlantic one, and that it must have come to an end in the first half of the latter. Among the earlier investigators the botanist Mrs VERNEER-LOUMAN and some geologists had arrived at the conclusion that the sudden transgression of the North sea which made an end to the formation of peat, took place in the boreal period, and hat... |
| Tipo: Article / Letter to the editor |
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| Ano: 1952 |
URL: http://www.repository.naturalis.nl/record/535091 |
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| Registros recuperados: 23 | |
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