SABIIA - Sistema Aberto e Integrado de Informação em Agricultura (Sabiia)

154 plant species, chosen at random, and collected in the Netherlands were investigated cytologically. The chromosome numbers determined were compared with data known from other countries.

Enige opmerkingen over Hieracium pilosella L. in Nederland

Ano: 1963

URL: http://www.repository.naturalis.nl/record/534994

In the Netherlands two morphologically distinct groups of plants occur in the section Pilosellina of the genus Hieracium. The diploids and (very rarely occurring) triploids are restricted (as far as is known up till now) to the Isle of Terschelling and belong to the species Hieracium peleterianum Merat, whereas the tetra- and pentaploids belong to the species H. pilosella. This is the first record of Hieracium peleterianum for the Netherlands.

Chromosome numbers of flowering plants in the Netherlands II

Ano: 1968

URL: http://www.repository.naturalis.nl/record/528086

The chromosome number of 157 species of Angiospermae occurring in the Netherlands is dealt with.

Chromosome numbers of flowering plants in the Netherlands. V

Ano: 1966

URL: http://www.repository.naturalis.nl/record/535049

The present paper, the fifth¹) in this series, is a continuation of the documented list of chromosome numbers of Angiospermae occurring in the Netherlands. In this paper 49 species and two hybrids are listed. Some species show variation in chromosome number, as was concluded after comparison of our results with those of other authors [cf. the lists published by Löve and Löve (1961); Cave et al. (1956-1964); Ornduff (1967, 1968, 1969); Solbrig and Gadella (1970); Moore (1970)]. Some notes on 14 species and two hybrids are given.

The chromosome number of Galactites duriaei Spach (Comp.)

Ano: 1971

URL: http://www.repository.naturalis.nl/record/534685

Gadella, Th.W.J.; Kliphuis, E.; Mennega, E.A..

In a previous paper (Gadella c.s. 1966) a list of chromosome numbers of flowering plants of S. France and Spain was published. Unfortunately, one of the plants was misidentified. Collection number 61, collected near Javea, Monte Mongo, Alicante (Spain), was incorrectly assigned to Cirsium acarna (L.) Moench. The plant was considered to be a Cirsium in view of the plumose pappus. The chromosome number of a number of plants grown from this seedsample turned out to be 2n = 22, a number not found earlier in any Eurasiatic species of Cirsium. Moore & Frankton (1963) studied several North American species of the genus Cirsium and pointed out that in the North American representatives of Cirsium the chromosome numbers 2n = 34, 32, 30, 28, 26, 24, 22, 20, 18...

Chromosome numbers of Parnassia palustris L. in the Netherlands

Ano: 1968

URL: http://www.repository.naturalis.nl/record/535059

Kliphuis, E.; Gadella, Th.W.J.; Dorrat-Haaksma, E.P..

In Sweden Erlandsson (1942) showed that the species Parnassia palustris L. has two chromosome numbers, 2n = 18 and 2n = 36. Rozanova (1940) found the same numbers in plants collected in the U.S.S.R. Some morphological differences could be demonstrated in the Swedish material (Erlandsson, 1942). This was confirmed by Löve and Löve (1944) and, therefore, these authors (1950) distinguish 2 species: the diploid Parnassia palustris L. em. Löve and the tetraploid Parnassia obtusiflora Rupr. em. Löve, also separated by sterility barriers and by their geographical distribution. In the Netherlands a tetraploid population was found by Gadella and Kliphuis (1963). As the tetraploid population occurs in an area situated far south of the circumpolar distribution area...

Cytotaxonimic studies in the genus Symphytum IV. Cytogeographic investigations in Symphytum officinale L

Ano: 1965

URL: http://www.repository.naturalis.nl/record/534811

106 populations of Symphytum officinale were cytologically investigated. The distribution of white-flowered diploids and white- and purple-flowered tetraploids in Europa is discussed. The authors present a hypothesis which aims to give an explanation for the observed differences in distribution pattern.

Chromosome numbers of flowering plants in the Netherlands, IV

Ano: 1972

URL: http://www.repository.naturalis.nl/record/535210

The chromosome numbers of 86 species of Angiospermae occurring in the Netherlands are reported.

Chromosome numbers of flowering plants in the Netherlands. III

Ano: 1968

URL: http://www.repository.naturalis.nl/record/534804

In the present paper, the third in this series, the chromosome numbers of 46 species of Angiospermae occurring in the Netherlands, are listed. A comparison of our results with data derived from literature revealed the fact that these species show cytological differentiation in their distribution area.

Floristic and Cytotaxonomic notes on the flora of the Maltese Islands

Ano: 1967

URL: http://www.repository.naturalis.nl/record/535171

Kramer, K.U.; Westra, L.Y.Th.; Kliphuis, E.; Gadella, Th.W.J..

In the spring of 1968 and 1969 the two senior authors visited the Maltese Islands of Malta and Gozo and collected and photographed plants. The entire herbarium collection amounts to about 350 numbers. The first set is deposited in the herbarium of the State University of Utrecht; duplicates were sent chiefly to the herbarium of the Royal Botanic Gardens, Edinburgh. Critical determination of the material yielded some results which may be interesting from a floristictaxonomic viewpoint and are therefore reported below. Beside herbarium material fruits and seeds were collected; the samples that germinated were investigated cytotaxonomically by the two junior authors. The results are also presented in the following. The first truly comprehensive account of the...

Cytotaxonomic studies in Galium palustre L

Ano: 1972

URL: http://www.repository.naturalis.nl/record/535096

Cytological investigations within Galium palustre L. showed the occurrence of three cytotypes, a diploid with 2n=24 chromosomes, a tetraploid with 2n=48 and an octoploid with 2n=96. Comparative morphological investigations, together with transplantation and crossing experiments confirmed the complexity of the species. The cytotypes are here considered to be subspecies of Galium palustre L.

Cytotaxonomic notes on some Galium species, Galium silvaticum L., Galium aristatum L. and Galium schultesii Vest

Ano: 1974

URL: http://www.repository.naturalis.nl/record/534949

The three species Galium silvaticum L., Galium aristatum L. and Galium schultesii Vest show differences in morphology, cytology and geographical distribution. These differences are described and discussed. Crossing experiments between the three species were without results. No hybrid could be obtained. Galium silvaticum, Galium aristatum and Galium schultesii must be considered as separate species.

Chromosome numbers and seedling morphology of some Angiospermae collected in Brazil

Ano: 1970

URL: http://www.repository.naturalis.nl/record/535233

Gadella, Th.W.J.; Kliphuis, E.; Lindeman, J.C.; Mennega, E.A..

The chromosome numbers of 31 species of Angiospermae collected in S. Brazil were determined. Of these species 5 were studied before, the other numbers are new, 11 are first counts for genera and one even for a family. Some notes on the cytology and morphology are added.

Cytotaxonomic studies in the genus Symphytum. II. Crossing experiments between Symphytum officinale L. and Symphytum asperum Lepech

Ano: 1969

URL: http://www.repository.naturalis.nl/record/534873

Crossing experiments were carried out between the three cytotypes (2n=24, 2n=40 and 2n=48) of Symphytum officinale and that of Symphytum asperum (2n=32), The results indicate that morphologically closely related types are sometimes crossable, whereas in other cases no hybrids could be produced. On the other hand morphologically very distinct types could be crossed with great ease. The significance of these studies for the elucidation of taxonomic problems is discussed.

Cytotaxonomic investigations in some Angiosperms collected in the Valley of Aosta and in the National Park « Gran Paradiso »

Ano: 1969

URL: http://www.repository.naturalis.nl/record/535024

The chromosome number of 53 species of Angiosperms, occurring in the Valley of Aosta and in the National Park « Gran Paradise » was determined. Some notes on the taxonomy of some species are presented in this paper.

Cytotaxonomic notes on some Galium species. B

Ano: 1970

URL: http://www.repository.naturalis.nl/record/534917

Plants grown up from seeds collected in the wild were cultivated in the experimental garden. These plants were investigated cytologically and morphologically. They turned out to be tetraploids with 2n =44 chromosomes. This is the same number as reported by Fagerlind (1937) in material from unknown origin and by van Loon (1974) in plants from Lanzarote, the Canaries. The metaphase-plates of roottip mitosis have a regular pattern, but some difference in length of the chromosomes can be observed. B-chromosomes or satellites are not present (fig. 10.5).

Een merkwaardige vorm van Hieracium pilosella L. gevonden bij Winterswijk

Ano: 1974

URL: http://www.repository.naturalis.nl/record/535124

The authors mention the pentaploid (2n = 45) Hieracium pilosella subsp. subvirescens N.P., found near Winterswijk (prov. Gelderland).

Cytotaxonomic notes on some Galium species Galium boreale L. II (Taxonomy G. boreale L. and allied species)

Ano: 1968

URL: http://www.repository.naturalis.nl/record/527009

Comparative morphological investigation of Galium boreale L. on herbarium specimen from different parts of the area confirmed the complexity of this species as stated by others. This is discussed. Based on fruit-indument characters it is concluded that four varieties can be distinguished.

Cytological observations in relation to the taxonomy of the Orchids of the Netherlands

Ano: 1973

URL: http://www.repository.naturalis.nl/record/534732

1. The Orchids in the Netherlands have been subjected to a cytological investigation. 2. The division of the genera Orchis (L.) Klinge into two new genera: Orchis (L.) Vermln. and Dactylorchis (Kl.) Vermln. (Vermeulen, 1947), could be confirmed. 3. In Listera ovata (L.) R. Br. the diploid chromosome number is 34. Deviating numbers 2n = 35 and 2n = 36 were counted. Because aberations in chromosome number do not cause morphological differences these aberations seem to be unimportant. 4. Out of the material investigated it might be concluded that for the moment it does not seem to be correct to consider Dactylorchis fuchsii (Druce) Vermln, as a separate species besides Dactylorchis maculata (L.) Vermln. It seems more likely that D. fuchsii and D. maculata...

Cytotaxonomic notes on some Galium species. A

Ano: 1963

URL: http://www.repository.naturalis.nl/record/534720

Within the frame work of general cytotaxonomic studies of various Galium species the following species were included: Galium rotundifolium L., Galium arenarium Lois., Galium triflorum Mich., Galium uliginosum L., Galium pumilum Murr., Galium sterneri Ehrend., Galium oelandicum (Stern, et Hyl.) Ehrend., Galium spurium L., Galium tricornutum Dandy, Galium verrucosum Huds. and Galium purpureum L. Combined cytological and morphological studies were made on plants cultivated under uniform conditions during several years.