636 research outputs found
Taxonomy of Chlorocyathus (Apocynaceae: Periplocoideae)
No full textAbstractThe genus name Chlorocyathus was coined by Oliver [Oliver, D., 1887. Chlorocyathus monteiroae. Hooker, Icones plantarum 16, t. 1557 and 1591.] for a specimen collected at Maputo, Mozambique. [Brown, N.E., 1907. Raphionacme monteiroae. In: Thiselton-Dyer, W.T. (Ed.), Flora Capensis, vol. 4. Lovell Reeve and Co, London, pp. 533–534.] sunk the monotypic Chlorocyathus into Raphionacme Harv. However, new information shows that Oliver was correct in regarding Chlorocyathus as different from Raphionacme. The name Chlorocyathus is thus reinstated, and the monotypic Kappia Venter, A.P. Dold and R.L.Verh., which resembles Chlorocyathus closely, becomes a synonym of it. Chlorocyathus will therefore include two species, C. monteiroae Oliv. and C. lobulata (Venter and R.L.Verh.) Venter. Nomenclature, descriptions, distribution patterns, ecology, and a key to the two species of Chlorocyathus are provided. Chlorocyathus is, furthermore, compared with selected African genera of Periplocoideae, and a key is provided to the tuberous-rooted African periplocoid genera
Kappia lobulata (Apocynaceae, Periplocoideae), a new genus from South Africa
No full textAbstractKappia, a new genus from the Fish River Valley in the Eastern Cape Province, South Africa is presented. At first described as Raphionacme lobulata Venter and R.L.Verh. [Venter, H.J.T., Verhoeven, R.L. 1988. Raphionacme lobulata (Periplocaceae), a new species from the eastern Cape Province, South Africa. South African Journal of Botany 54, 603–606.] based on a single specimen collected in 1936, recently discovered plants of this species proved it to be a new genus. In habit Kappia resembles Baseonema Schltr. and Rendle, Batesanthus N.E.Br., Mondia Skeels and Stomatostemma N.E.Br. However, as far as floral structure is concerned, Kappia reveals more affinity with Raphionacme Harv. DNA sequence data show Kappia to be distinct from Batesanthus, Mondia and Raphionacme Harv. and weakly supported as a sister to Stomatostemma
Raphionacme chimanimaniana (Periplocaceae), a new species from Zimbabwe
No full textRaphionacme chimanimaniana Venter & Verhoeven, a new species from Zimbabwe is described. It is recognized by its erect stems, linear-lanceolate leaves which are hirsute and glandular, few-flowered inflorescences and magenta to white flowers. Plants inhabit scrubby veld at high altitude in the Chimanimani Mountains. R. chimanimaniana resembles R. brownii Scott Elliot and R. pulchella Venter & Verhoeven. All three species erect with linear leaves and white to purple flowers. R. chimanimaniana is distinguished from R. brownii and R. pulchella by the few-flowered inflorescences with large flowers, its columnar corona bases and glandular hirsute indumentum
Raphionacme moyalicus (Periplocaceae), a new species from Kenya
No full textRaphionacme moyalicus Venter & R.L. Verh., a new species from Moyale, Northern Frontier Province, Kenya, is described and figured. A map with its known distribution is also provided. R. moyalicus shows affinity with R. michelii De Wild., R. borenensis Venter & M.G. Gilbert and R. arabica A,G. Mill. & Biagi. These species all have in common filiform corona lobes and stamens with fleshy, laterally dilated filament bases. All are erect to spreading, single- or few-stemmed, geophytic herbs. R. moyalicus is distinguished by its long corona lobes, twice as long as the corolla lobes, the small flowers and the dense, scaberulous indumentum
Raphionacme elsana (Periplocaceae), a new species from Natal, South Africa
No full textRaphionacme elsana Venter & Verhoeven, a new species from northern Zululand, in Natal, is described and illustrated, and a map showing its known distribution is provided. R. elsana appears to be closely related to R. velutina Schltr. and is vegetatively identical; however, in its bicoloured corona with green lateral segments and the central segment of the lobes much broadened at the base and deep violet in colour, the new species is easily distinguished when in flower, while in fruit it differs significantly in its keel-shaped, much shorter and stout follicles (in R. velutina very narrowly ovoid). In this latter character R. elsana appears also to be related to R. madiensis S. Moore, from Central Africa, and R. namibiana Venter & Verhoeven, from South West Africa/Namibia
A new species of Lycium (Solanaceae) from Namibia
No full textLycium grandicalyx Joubert & Venter, a new species from Namibia is described. This species differs from other Lycium species by the enlarged and broadly urceolate calyx, which encloses the berry completely in the fruiting stage and by the presence of bicornate, stellate hairs. Florally L. grandicalyx most resembles L. campanulatum E. Mey., L. ferocissimum Miers, L. pilifolium C.H. Wr., L. prunus-spinosa Dun. and L. schizocalyx C.H. Wr
A new species of Raphionacme (Periplocaceae) from the Orange Free State
No full textRaphionacme dyeri Retief & Venter, a new species from the Orange Free State, is described. The species is closely related to R. zeyheri Harv. The yellowish green inner surface of each corolla lobe with a purple or magenta ‘V’ marking on the upper half, distinguishes R. dyeri from all the other Rtaphionacme species
Raphionacme haeneliae (Periplocaceae), a new species from the Namib Desert, Namibia
No full textRaphionacme haeneliae Venter & Verhoeven, a new species collected in the Namib Naukluft Park, Namibia, is described and illustrated. A map with its present known distribution is provided. R. haeneliae reveals affinity with R. lanceolata Schinz in the spreading, much-branched plants, large ovate foliage leaves and corona lobes that are basally unsegmented. R. haeneliae is distinguished by its lemon-green and pink corolla lobes, long filiform corona lobes and paired pincer-like follicles
A taxonomic revision of Schlechterella (Periplocoideae, Apocynaceae)
No full textA taxonomic revision of Schlechterella K. Schum. is hereby presented. Two species are recognised, S. africana (Schltr.) K. Schum. and S. abyssinica (Chiov.) Venter & R.L. Verh. The latter species is transferred from Raphionacme Harv. and Triodoglossum Bullock. Schlechterella is unique in the African Periplocoideae as its corona lobes are fused and its pollen is borne in pollinia instead of in single tetrads
Nomenclature correction in Parquetina (Apocynaceae: Periplocoideae)
No full textAbstractBullock (1961) combined Periploca nigrescens Afzel. and Omphalogonus calophyllus Baill. in Parquetina nigrescens (Afzel.) Bullock. Based on their conspicuously different floral morphology, Venter and Verhoeven (1996) reversed Bullock's combination to Periploca nigrescens Afzel. and O. calophyllus Baill. However, DNA sequence analyses (Ionta and Judd, 2007) indicated that Periploca nigrescens and O. calophyllus are sister species in Parquetina. A nomenclatural correction of Parquetina and its two species, as well as a new generic protologue and species key have thus become necessary. The bitypic Parquetina is characterised by the following features: lianas that turn black when dry, relatively large and coriaceous leaves, fleshy coriaceous corolla with inside pink, maroon or deep crimson to black-violet, and pubescent or hirsute stamens with pollen in tetrads
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