Fig 4 - uploaded by Brian Du Preez
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Indigofera gariepensis. 1À Flower front view; 2 À Flower side view; 3 À Flower ventral view; 4 À Single leaf and developing inflorescence; 5 À Leaflets adaxial view; 6 À Leaflets abaxial view; 7 À Stipules; 8 À Mature inflorescence; 9 À Whole plant in habitat. Scale bars: 2 mm (images 2À3 and 7); 5 mm (images 4À6 and 8). Photographs by B. du Preez.
Source publication
Four new Indigofera species are described from the Greater Cape Floristic Region (GCFR). Indigofera barkeri is a new annual from the Richtersveld, with small flowers, 3.5À4.0 mm long, pinnately trifoliolate leaves and laterally flattened seeds. Indigofera dodii is endemic to the area around Cape Town, growing on granite and shaly slopes. It has api...
Context in source publication
Context 1
... hairs basal on carinal anther. Pistil 4.0À4.6 mm long; ovary 1.7À2.0 mm long, green, strigillose; style 3.5À3.8 mm long, erect to § 1.5 mm high distally; stigma capitate. Fruit 5.5À10.0 £ 1.5À2.2 mm, cylindrical, laterally compressed between seeds, densely strigillose-hispid, 2À4-seeded. Seeds 1.2À1.4 £ 1.1À1.3 mm, spherical, toffee brown (Fig. ...
Citations
Indigofera L. is the most diverse genus in the tribe Indigofereae and the third largest genus in the Fabaceae with over 750 species distributed in most tropical to temperate areas of the world. The centre of diversity of the genus lies on the African continent, accounting for over two-thirds of its global diversity. Diversification of Indigofer a’s four main clades began in the Early Miocene, with the Tethyan and Cape Clades having slightly older crown ages than the Pantropical and Paleotropical Clades. Using biogeographical models under a newly assembled, more comprehensively-sampled ITS phylogeny, we confirmed that the tribe Indigofereae originated in the Africa-Madagascar centre, with the genus Indigofera resolving with a mainland African origin c. 38 Mya. Long-distance dispersals were rare, but did occur from Africa to South America and Africa to Australia during the late Miocene. Multiple dispersals from Africa into Asia took place via the arid north-east African and Arabian corridors during the same period. At least four Indigofera dispersals to Madagascar took place during the Miocene. The Cape Clade is a narrowly endemic lineage, mostly restricted to the Greater Cape Floristic Region (GCFR) of southwestern South Africa, while the Tethyan, Pantropical and Paleotropical Clades are more widely dispersed across multiple continents. Both the Cape and Tethyan Clades display strong signals for arid origins in the southern Namib and Richtersveld regions of Southwestern Africa. This study emphasizes the importance of the global Succulent biome in shaping biogeographical patterns of Indigofera globally, particularly in terms of biome conservatism and how it created corridors facilitating trans-continental dispersal.
Indigofera sect. Brachypodae DC. is a large group of approximately 40 species within the Cape Clade, mostly restricted to the Core Cape Region (CCR), with only two species extending eastwards to Grahamstown. This section has been subdivided into four subsections based primarily on morphological characters. Subsect. Bra-chypodae is the most diverse of the four subsections and is characterised by having sclerophyllous leaves, with a distinctly sunken midvein and (usually) revolute leaf margins. This group occurs almost exclusively within Fynbos, with a few species growing in coastal Strandveld vegetation. Revised here, nineteen species are recognized in this subsection, eleven of which are new to science. Additionally, a new infraspecific combination is created for I. pinnata following nomenclatural and identification confusion. All species are formally described here, with photographic plates of each and illustrations of corollas and calyces provided. Many of the new species were either unrecognised at the time of the last revision in Flora Capensis 2, or have only been discovered recently. Distribution maps and information regarding habitat preference, phenology, and ecology and recommended IUCN red list status of each species are also provided.
