Browsing by Author "Hall, A V"

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    Studies in the genus Eulophia R. Br.
    (1959) Hall, A V; Schelpe, E A C L E
    Detailed variation studies of 23 species of the genus Eulopbia R. Br. (Orchidaceae) indicate that six taxa may be upheld as distinct species, together with two or possibly three intraspecific taxa, whose status can only be assessed on the basis of further field work. It is considered highly likely that the remaining 17 taxa should be relegated to the synonymy of the six species upheld, possibly together with a further eight doubtfully distinct species of which only descriptions were available.
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    Studies of the South African species of Eulophia R. Br. ex. Lindl. (Orchidaceae)
    (1963) Hall, A V; Schelpe, EACLE
    The present work was undertaken to provide a much-needed taxonomic revision of the South African members of the genus Eulophia R.Br. ex Lindl. (Orchidaceae). To obtain data for delimiting and giving rank to taxa, studies were made of morphological variation, geographical distribution, cytology and ecology.
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    Studies on Australian acacias in the South Western Cape, South Africa
    (1980) Milton, Suzanne Jane; Hall, A V; Moll, EJ
    The thesis comprises six papers dealing with aspects of the ecology of the exotic Acacias which are considered to be weeds in the South Western Cape. Topics covered are the origins and reasons for success of the Australian Acacias in the Cape, their phenology, reproductive biology, shade tolerance, litterfall and biomass. The implications of these findings for management are discussed in the general conclusion, and the raw data is tabulated in four appendices. The work is illustrated with 37 figures.
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    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.