Huernia humpatana (Apocynaceae), a new species from southern Angola

AbstractA 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 6mm 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 2mm long and only indistinct grooves between the angles in H. similis. Furthermore, in H. similis the nodding corolla is ±9mm in diameter with sepals ±2mm long, while in H. humpatana the horizontally facing corolla is 18–20mm in diameter with sepals 4–6mm long

The rediscovery of Schizostephanus gossweileri and its phylogenetic position

AbstractTwo 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