Browsing by Subject "Apocynaceae"

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    A new species of Caralluma (Apocynaceae-Asclepiadoideae-Ceropegieae) from the Yemen
    (2010) Bruyns, Peter
    In this paper a new species, Caralluma faucicola Bruyns, closely related to C. hexagona Lavranos, is described from near the border between the former North and South Yemen in Arabia.
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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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    Huernia humpatana (Apocynaceae) a new species from southern Angola
    (2010) Bruyns, Peter V
    A new species, Huernia humpatana Bruyns (Apocynaceae–Ceropegieae), closely related to H. similis N.E.Br., is described from the Chela Mountains of Huila Province in southern Angola. The two species are distinguished by the 5-angled and erect stems with more prominent tubercles up to 6 mm long joined into clear angles and separated by V-shaped grooves in H. humpatana as opposed to very obtusely 4-angled stems with tubercles only 2 mm long and only indistinct grooves between the angles in H. similis. Furthermore, in H. similis the nodding corolla is ± 9 mm in diameter with sepals ± 2 mm long, while in H. humpatana the horizontally facing corolla is 18–20 mm in diameter with sepals 4–6 mm long.
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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 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.