Browsing by Subject "Botany - South Africa"

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    A revision of the South African species of Holothrix Rich. ex Lindl. (Orchidaceae)
    (1979) Immelman, Kathleen Leonore; Schelpe, E A C L E
    The genus Holothrix in South Africa is desc.ribe.d and its taxonomic history discussed. The results of using a computer to draw up a key and a dendrogram of the species are briefly discussed, as are some of the problems experienced. Various morphological characters are evaluated for their usefulness or otherwise in distinguishing species, and a key is provided. Where applicable, problems commonly encountered when attempting to identify the species are mentioned, and those characters pointed out which will distinguish the species. Details of biological interest are mentioned. Each species is illustrated by a drawing of sepal, petal and lip. Those species available in liquid preservative have the whole flower drawn as well, while those where a live plant could be obtained are illustrated in full, with a drawing of the whole plant, leaves, column and pollinia. In those cases where a range in shape, as opposed to size, is experienced, drawings are presented to illustrate this range. A detailed map of each species is presented, using the 1° gridsquare system, and also a table of the ranges of rainfall and altitude within the range of each species.
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    Open Access
    The vegetation of the Cape Hangklip area
    (1972) Boucher, Charles; Hall, A V
    Approximately 11 500 ha of coastal plain and mountain vegetation in the Cape Hangklip area of the South-Western Cape Province of South Africa was studied. The suitability of homogeneity functions and of the association-analysis techniques for the analysis of large areas of the distinctive coastal and fynbos vegetation found in the Mediterranean type of climate in this region were investigated. Data were collected at 150 sampling sites of 10 x 5 metres each, which were randomly located on grid intersections within physiographic-physiognomic units delimited on aerial photographs. Phytosociological techniques were used to arrange the data prior to further analysis using frequency modulated homogeneity functions. A classification of the vegetation into 32 communities is proposed with primary subdivisions into Broad-leaved Scrub and Fynbos. This classification is based on the results of the association-analysis of the data.