Browsing by Author "Schelpe, E A C L E"

Now showing 1 - 9 of 9
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    Contributions to the systematics of the genus Schizochilus
    (1971) MacRobert, M; MacRobert, M; E.A.C.L.E Schelpe.; Schelpe, E A C L E
    The genus Schizochilus, first described by Sonder in 1847 as an extra-tropical Southern African orchid, is based upon material collected by Ecklon and Zeyher in moist places in the Winterberg mountains. The main characters of the flower are a spurred, fleshy three-cleft lip; and free, erect sepals and petals, all three sepals being equal and the petals much smaller than the sepals. The type species, S. zeyheri Sond., is described as having a small number (2-3) of linear-oblong basal leaves and a spike of 16-20 small flowers. Sepals and petals are both noted as white, the sepals about 0,5 cm in length (2.5 lines) and marked with 3 rosy veins, the petals lanceolate and half the length of the sepals. The spur is "not much shorter than the labellum" and the ovary, "almost twice the length of the spur". The lip itself, obovate in outline, is covered with very small crystalline papillae, the lateral lobes being "somewhat shorter than title broader, obtuse intermediate lobe". There appears to be no mention of the basal tubercles or calli on the lip.
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    Genus Astroloba Uitewaal (Liliaceae)
    (1965) Roberts Reinecke, Pandora; Schelpe, E A C L E
    The present work was undertaken to provide a much needed taxonomic revision of the genus Astroloba Uitew. Type material of all previously described species appears to be completely lacking. This revision was based almost entirely on living material collected by the author. Studies were made of morphological variation, geographical distribution, cytology and ecology. The morphological studies were based on field population samples. As a result of these studies, seven species and three subspecies were established, of which three species and one subspecies are new : A. rugosa Roberts, A. hallii Roberts, A. smutsiana Roberts and A. foliolosa subsp. robusta Roberts. One new combination is made: A. foliolosa subsp. congesta (Salm-Dyk) Roberts. A new key to the species is given. Because this genus is so little known, a large number of plates are included. A new hybrid genus, X Astroworthia Roberts, was established for hybrids between the genera Astroloba and Haworthia Duval. This consists at present of one species, X Astroworthia bicarinata (Haworth) Roberts comb. nov.
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    A revision of the Gibbaeinae (Mesembryanthemaceae)
    (1974) Glen, Hugh Francis; Schelpe, E A C L E
    Of the fourteen species of Gibbaeum recognised in this work, one, G. austricolum is new. A new combination, G. pubescens (Lettsom ex Haw.) N.E.Br. subsp. shandii (N.E.Br.) Glen, is made at the subspecific level. Three monospecific genera, Antegibbaeum, Didymaotus and Muiria, and two intergeneric hybrids, X Muiriogibbaeum and X Gibbaeophyllum, the latter here described for the first time, are recognised. A field study was made over the entire distribution range of the subtribe. Further studies were made of the vegetative, flower and fruit morphology, cuticular structure and seed and pollen morphology of the group. A numerical-taxonomic treatment of date gathered from these studies was made. Keys for field and herbarium use, as well as a polyclave, are provided. Various features of the cytology, habitat preferences, conservation status and possible evolution of the group are noted.
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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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    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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    A study of the phytoplankton of the South Western Indian Ocean
    (1964) Taylor, F J R; Schelpe, E A C L E; Day, J H O
    Although the phytoplankton of the waters off the west coast of South Africa (the Benguela Current region) has been the subject of several detailed studies in the past, data on that of the S.W. Indian Ocean has been almost entirely restricted to incidental references in the reports of expeditions which have passed through the area. Consequently, little has been known of the species composition and distribution of the phytoplankton, and nothing of its seasonal fluctuations. This study was designed to provide a broad picture of the phytoplankton of the area, the primary objective being a critical determination of the species composition. The material was collected by the S.A.S. Natal on four seasonal cruises in the area as a contribution to the International Indian Ocean Expeditions. A net-sampling technique was used to provide the maximum amount of material for quantitative analysis. The phytoplankton was found to be extremely rich in variety, 402 taxa being identified from the 98 samples collected. Of these 233 were diatom taxa, 157 dinoflagellate taxa, and the remainder being composed of members of the Chrysophyeeae (coccolithophorids), Cyanophyceae and Xanthophyceae. These are listed in the systematic section together with original references and other references used by the author for their identification. The local and general distributions or the taxa are described and many of the taxa are illustrated by line drawings or microphotographs. 5 new species are described, as well as 1 new variety, and it was found necessary to provide new names for several species. Full systematic details are given for all new or rare taxa.
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    A taxonomic monograph of Lampranthus and allied genera (Mesembryanthemaceae)
    (1978) Glen, Hugh Francis; Schelpe, E A C L E
    For the first time since the genera were described, a taxonomic monograph of Lampranthus and its immediate allies was undertaken. A numerical study of 97 characters (132 character strings) of each of some 270 items was undertaken, using Hall's BOLAID package of numerical aids. The genus Lampranthus was reduced from about 240 species to 56. The genus Scopelogena was shown to be monotypic and closely related to Lampranthus. Braunsia was reduced from 5 species to 3. It is shown that the genera Oscularia and Esterhuysenia are inseparable from Lampranthus. Because Oscularia was described before Lampranthus, and because the latter is by far the better known, it is considered necessary to propose the conservation of Lampranthus over Oscularia. Such a proposal is included as an appendix. A new and more natural delimitation of the subtribe Lampranthinae, including Gibbaeinae and excluding the genera Cerochlamys, Disphyma and Ebracteola, is proposed.
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    Taxonomic studies on the genus Crassula L
    (1974) Tolken, H R; Schelpe, E A C L E
    The difficulties involved in the taxonomy of the genus Crassula, such as the extensive variation and often difficult species complexes, vicariousness and hybridization, are sketched against a historical background. These difficulties have prompted the author to review concepts of taxa from subspecific to generic level and have also led to the approach adopted in this work. It is argued that in several genera and sections, as previously recognized, too much stress was placed on the several floral characters which form part of a pollination syndrome which is shown up by convergent developments of these flower types. The different types of seedling morphology recognized are considered in relation to the morphology of adult plants and their affinities at specific and sectional level. The distribution of the hydathodes has proved useful in the delimitation of supra-specific taxau ThB morphology of the developing seedlings and the distribution of the hydathodes on the leaves become the main arguments for a new classification in the genus Crassula. A cytological review stresses the different basic chromosome numbers (8,7) and their structural differences for the delimitation of the subgenera. Problems in determining the original basic number and the high percentage of polyploidy with various rainfall conditions are evaluated. Subsequently the characteristics and affinities of Crassula and its subgeneric taxa are briefly discussed. The key to the species, subspecies and varieties is divided into twelve groups which are similar to sections or groups of sections recognized. Within the genus Crassula 2 supgenera, 21 sections, 11 subsections and 144 Southern African species with 124 subspecific taxa are distinguished, described, their variation recorded and their diagnostic features accentuated. Species insufficiently known and excluded are briefly discussed.
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    A vegetation survey of the Cape of Good Hope Nature Reserve
    (1969) Taylor, Hugh Colin; Schelpe, E A C L E
    The survey was undertaken on a 30 square mile (78 square kilometer) area at the southern tip of the Cape Peninsula, in the Cape Province of South Africa. The applicability of association-analysis to the distinctive fynbos vegetation found in the Mediterranean type climate of this region, was tested. Subjectively, two formations, Fynbos and Broad-leaved Scrub, were recognized. Fynbos was subdivided into two alliances, Coast and Inland, and ten individually described associations. The association-analysis, based on 100 grid samples each 5 x 10 metres in extent, revealed 23 final groups. To provide an independent assessment of association-analysis, synthesis tables were constructed from the original plot data. The blocks of species-in-plots, obtained by standardized manipulation of the tabulated data, appear to provide a better correlation with habitat than either the final or recombined groups of the association-analysis.