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  1. Article: A new species of *Rhoicissus* (Vitaceae) from Sekhukhuneland, South Africa

    Retief, E. / Siebert, S. J. / Wyk, A. E. van

    South African Journal of Botany

    2001  Volume 67, Issue 2, Page(s) 230–234

    Abstract: A new member of *Rhoicissus* is described, illustrated, compared with other members of the genus and named *R. sekhukhuniensis* Retief, Siebert & A.E.van Wyk. It occurs mainly in the geographical area called Sekhukhuneland, situated in the Mpumalanga and ...

    Institution National Herbarium, National Botanical Inst., Pretoria 0001, Rep. of South Africa
    Abstract A new member of *Rhoicissus* is described, illustrated, compared with other members of the genus and named *R. sekhukhuniensis* Retief, Siebert & A.E.van Wyk. It occurs mainly in the geographical area called Sekhukhuneland, situated in the Mpumalanga and Northern Provinces of South Africa. *R. sekhukhuniensis* is a scandent shrub, characterised by a dense indumentum of reddish brown hair on young growth, with older parts being more or less glabrous. It is closely related to *R. tomentosa* (Lam.) Wild & R.B.Drumm, but can be distinguished by its trifoliolate leaves with coarsely toothed margins. Pollen are tricolporate with a reticulate tectum. Plants flower in October/November (early summer), with few-flowered inflorescences. Fruits are reddish, ripening to black, and edible with a pleasant grape-like flavour. Plants grow among boulders in mountainous regions with a mean annual rainfall of 300-500 mm, on dry, warm slopes and on clayey soils derived from ultramafic rocks. [15324] (D. Saayman, Stellenbosch)
    Keywords VITACEAE ; MORPHOLOGY ; BIOLOGY ; REPUBLIC OF SOUTH AFRICA
    Language English
    Document type Article
    ZDB-ID 2126918-X
    ISSN 0254-6299
    ISSN 0254-6299
    Database Viticulture and Oenology Abstracts

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  2. Article: A new species of Putterlickia (Celastraceae) from southern Natal and Pondoland

    Wyk, A.E. van / Mostert, S.C

    South African journal of botany : official journal of the South African Association of Botanists = Suid-Afrikaanse tydskrif vir plantkunde : amptelike tydskrif van die Suid-Afrikaanse Genootskap van Plantkundiges. Aug 1987. v. 53 (4)

    1987  

    Keywords Putterlickia ; taxonomy ; new taxa ; plant anatomy ; geographical distribution ; South Africa
    Language English
    Dates of publication 1987-08
    Size p. 267-270., ill., maps.
    Document type Article
    Note Summary in Afrikaans.
    Database NAL-Catalogue (AGRICOLA)

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  3. Article: Maytenus oleosa (Celastraceae), a new species from southern Natal and Pondoland

    Wyk, A.E. van / Archer, R.H

    South African journal of botany : official journal of the South African Association of Botanists = Suid-Afrikaanse tydskrif vir plantkunde : amptelike tydskrif van die Suid-Afrikaanse Genootskap van Plantkundiges. Apr 1987. v. 53 (2)

    1987  

    Keywords Maytenus ; taxonomy ; new taxa ; geographical distribution ; plant anatomy ; ultrastructure ; South Africa
    Language English
    Dates of publication 1987-04
    Size p. 155-160., ill., maps.
    Document type Article
    Database NAL-Catalogue (AGRICOLA)

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  4. Article: A remarkable new species of Colubrina (Rhamnaceae) from Pondoland

    Wyk, A.E. van / Schrire, B.D

    South African journal of botany = Suid-Afrikaanse tydskrif vir plantkunde. Aug 1986. v. 52 (4)

    1986  

    Keywords Rhamnaceae ; new taxa ; taxonomy ; geographical distribution ; South Africa
    Language English
    Dates of publication 1986-08
    Size p. 379-382., ill., maps.
    Document type Article
    Note Summary in Afrikaans.
    Database NAL-Catalogue (AGRICOLA)

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  5. Article: The genus Eugenia (Myrtaceae) in Southern Africa: ontogeny and taxonomic value of the seed

    Wyk, A.E. van / Botha, R

    South African journal of botany = Suid-Afrikaanse tydskrif vir plantkunde. Feb 1984. v. 3 (1)

    1984  

    Title variant Genus Eugenia (Myrtaceae) in Southern Africa: ontogeny and taxonomic value of the seed [Morphology]
    Keywords Myrtaceae ; anatomy and morphology ; Southern Africa
    Language English
    Size p. 63-80., ill.
    Document type Article
    Note Summary in Afrikaans.
    Database NAL-Catalogue (AGRICOLA)

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  6. Article: Holz- und Rindenanatomie der Lauraceen IV. Dahlgrenodendron J.J.M. van der Merwe und van Wyk

    Richter, H.G. / Wyk, A.E. van

    IAWA Bulletin (Netherlands)

    1990  

    Institution Bundesforschungsanstalt für Forst- und Holzwirtschaft, Hamburg (Germany, F.R.). Inst. für Holzbiologie und Holzschutz
    Keywords Pflanzenanatomie ; Rinde ; Taxonomie ; Holz ; Suedafrika ; Lauraceae
    Language English
    Edition v. 11(2) p. 173-182
    Document type Article
    Database ELFIS - Nutrition, agriculture and forestry information system

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  7. Article: Extension of the geographical range and notes on the diagnostic characters of Canthium suberosum (Rubiaceae--Vanguerieae)

    Tilney, P.M / Kok, P.D.F / Wyk, A.E. van

    South African journal of botany : official journal of the South African Association of Botanists = Suid-Afrikaanse tydskrif vir plantkunde : amptelike tydskrif van die Suid-Afrikaanse Genootskap van Plantkundiges. Apr 1987. v. 53 (2)

    1987  

    Keywords Canthium ; taxonomy ; geographical distribution ; plant anatomy ; ultrastructure ; South Africa
    Language English
    Dates of publication 1987-04
    Size p. 180-183., ill., maps.
    Document type Article
    Database NAL-Catalogue (AGRICOLA)

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  8. Article: Studies in Pavetta (Rubiaceae). III. Pavetta lanceolata and its allies (section Aethiopinymphe)

    Kok, P.D.F / Wyk, A.E. van / Reyneke, W.F

    South African journal of botany : official journal of the South African Association of Botanists = Suid-Afrikaanse tydskrif vir plantkunde : amptelike tydskrif van die Suid-Afrikaanse Genootskap van Plantkundiges. Apr 1987. v. 53 (2)

    1987  

    Keywords Rubiaceae ; taxonomy ; geographical distribution ; plant morphology ; South Africa
    Language English
    Dates of publication 1987-04
    Size p. 147-154., ill.
    Document type Article
    Database NAL-Catalogue (AGRICOLA)

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  9. Article: The genus Eugenia L. (Myrtaceae) in southern Africa: the structure and taxonomic value of stomata

    WYK, A.E. VAN / ROBBERTSE, P.J / KOK, P.D.F

    Botanical journal of the Linnean Society. Jan 1982. v. 84 (1)

    1982  

    Abstract: The mature stomatal morphology of 11 southern African species of Eugenia, and also of E. uniflora L. (naturalized) and E. incerta Diimmer (a garden plant of unknown origin) has been studied by light and scanning electron microscopy. Leaves of all the ... ...

    Abstract The mature stomatal morphology of 11 southern African species of Eugenia, and also of E. uniflora L. (naturalized) and E. incerta Diimmer (a garden plant of unknown origin) has been studied by light and scanning electron microscopy. Leaves of all the species are hypostomatic and water-stomata are occasionally present. Two different stomatal types, X and Y, differing mainly in their cuticular ornamentation, were found in the southern African species. The grouping of species based on stomatal characters supports a previous grouping of species on the basis of periderm and seed characters. Conspicuous lipid bodies, usually present in the subsidiary cells, are limited to the southern African species. Although the subsidiary cells do not differ in shape and size from adjacent epidermal cells, their contents often have a higher tannin content than ordinary epidermal cells. The variable patterns of arrangement of the three to five subsidiary cells makes it difficult to identify the stomata with existing classifications based on mature topography. Thus, a new term ‘anomostaurocytic' is proposed for the stomatal type found in the southern African species. Stomata of E. uniflora and E. incerta are paracytic and anomocytic respectively, and the cuticular ornamentation of their stomata differs from those of the southern African species. The view that E. incerta is not closely related to the southern African species is supported by differences in its cuticular ornamentation, lack of lipid bodies in the subsidiary cells, anomocytic stomata and prominent T-pieces at the guard cell poles.
    Keywords Eugenia ; guard cells ; leaves ; lipid bodies ; ornamental plants ; scanning electron microscopy ; seeds ; stomata
    Language English
    Dates of publication 1982-01
    Size p. 41-56.
    Publishing place Blackwell Publishing Ltd
    Document type Article
    ZDB-ID 2975-0
    ISSN 0024-4074 ; 0373-5044
    ISSN 0024-4074 ; 0373-5044
    DOI 10.1111/j.1095-8339.1982.tb00359.x
    Database NAL-Catalogue (AGRICOLA)

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