Browsing by Author "Bruyns, P V"

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    A new species of Sarcostemma (Apocynaceae-Asclepiadoideae-Asclepiadeae) from Yemen
    (2011) Bruyns, P V
    Sarcostemma areysianum Bruyns is described from the southern mountains of Yemen. It appears to be most closely related to S. arabicum Bruyns & P. Forst. and S. socotranum Lavranos, differing from both by the taller gynostegium with narrow, mostly acute inner corona lobes. A key to the species from Arabia and Socotra is provided.
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    A revision of Astephanus (Apocynaceae)
    (Springer Verlag, 2003) Bruyns, P V
    The morphology is documented for the two species of the genus Astephanus R. Br. (Apocynaceae - Asclepiadoideae - Asclepiadeae), A. triflorus (L. f.) Schult. and A. zeyheri Turcz., which occur in the southwestern corner of southern Africa. Astephanus marginatus Decne. is a synonym of A. triflorus and so the earliest valid name for plants commonly known as A. marginatus is A. zeyheri. The similarities and differences from the closely related genus Microloma R. Br. are discussed. Various species from the New World have been included at one or other time in Astephanus. These are now excluded and a list of them is given, with their present taxonomic position.
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    The generic position of Caralluma dodsoniana
    (Cambridge University Press, 1995) Bruyns, P V; Meve, U
    The generic position of Caralluma dodsoniana Lavranos (Asclepiadaceae) is investigated. It is concluded that a monotypic genus to accommodate it is unnecessary and that it should be incorporated into the genus PseudolithosP. R. O. Bally as P. dodsonianus (Lavranos) Bruyns & Meve.
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    Morphology and taxonomy of Mondia (Apocynaceae: Periplocoideae)
    (2009) Venter, H J T; Verhoeven, R L; Bruyns, P V
    The bitypic Mondia Skeels is found in the moist tropical and subtropical forests of Africa. Both species are lianes with large leaves, fringe-like interpetiolar stipular ridges, large panicles and brownish, reddish to purplish flowers with conspicuous and well exposed gynostegia. Mondia resembles Batesanthus N.E.Br., Myriopteron Griff. and Tacazzea Decne. in being large woody climbers with large leaves, large many-flowered inflorescences, and rotate flowers with grooved translators and pollen of which the 4–6-porate grains are fused into tetrads. Mondia is distinguished from these genera by having fringe-like interpetiolar ridges and bi- or tri-segmented corona lobes. Batesanthus, furthermore, differs from Mondia by having fleshy interpetioler ridges, a corolla with recurvate tube and an annular corona. The species of Myriopteron and Tacazzea, in contrast to Mondia, have non-fleshy interpetiolar ridges, a herbaceous corolla with linear to narrowly ovate lobes, and in the case of Myriopteron keel-shaped follicles with lateral membranous fins. Apart from these three genera Mondia shows affinity to Chlorocyathus Oliv. and Stomatostemma N.E.Br. Although both genera are also large climbers, they are characterised by root tubers and flowers with campanulate corollas. Here we present descriptions of micro- and macro-morphological features of Mondia and its two species, as well as a key to the species and notes on distribution patterns, ecology and uses. We also discuss possible relationships with other genera among the Periplocoideae.
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    The systematic position of Rhytidocaulon (Apocynaceae-Asclepiadoideae)
    (Cambridge University Press, 1999) Bruyns, P V
    Rhytidocaulon P.R.O. Bally is reviewed. The relationships with other genera are discussed in the light of the character assessment carried out and it is suggested that it is closest to Caralluma R. Br. subg. Caralluma and Echidnopsis Hook. f. Descriptions of the genus and the eight known species are provided.
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    The rediscovery of Schizostephanus gossweileri and its phylogenetic position
    (2009) Bruyns, P V; Klak, C
    Two new records of Schizostephanus gossweileri (S. Moore) Liede from north-western Namibia and south-western Angola are documented and an amplified description is provided for the species. Analysis of ITS and trnL–F data provides additional evidence that this species belongs to Schizostephanus Hochst. ex K. Schum., where its relationship to S. alatus is strongly supported. The two species of Schizostephanus form a lineage that is either unsupported or weakly supported as sister to Cynanchum L. s.l.
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    The rediscovery of Schizostephanus gossweileri and its phylogenetic position
    (2009) Bruyns, P V; Klak, C
    Two new records of Schizostephanus gossweileri (S. Moore) Liede from north-western Namibia and south-western Angola are documented and an amplified description is provided for the species. Analysis of ITS and trnL–F data provides additional evidence that this species belongs to Schizostephanus Hochst. ex K. Schum., where its relationship to S. alatus is strongly supported. The two species of Schizostephanus form a lineage that is either unsupported or weakly supported as sister to Cynanchum L. s.l.