Question: What genus of flowering plants occurs throughout tropical Africa from Eritrea and Chad south to northern South Africa, and west to Senegal and Namibia, Kigelia or Cyclamen?

Context paragraphs:
Sabiceeae: Sabiceeae is a tribe of flowering plants in the Rubiaceae family and contains about 164 species in 7 genera.  Its representatives are found in tropical Africa, Madagascar, Sri Lanka, and from Mexico to tropical America.  The genus "Sabicea" is one of the rare genera in Rubiaceae that occurs both in tropical Africa and tropical America.

Kigelia: Kigelia is a genus of flowering plants in the family Bignoniaceae.  The genus comprises only one species, Kigelia africana, which occurs throughout tropical Africa from Eritrea and Chad south to northern South Africa, and west to Senegal and Namibia.  The Kigelia grows a fruit that grows up to 2 feet long, weighs about 15 lbs, and looks like sausage.

Cyclamen: Cyclamen ( or ) is a genus of 23 species of perennial flowering plants in the family Primulaceae.  Cyclamen species are native to Europe and the Mediterranean Basin east to Iran, with one species in Somalia.  They grow from tubers and are valued for their flowers with upswept petals and variably patterned leaves.

Oeceoclades ugandae: Oeceoclades ugandae is a terrestrial orchid species in the genus "Oeceoclades" that is native to parts of tropical Africa, including west tropical Africa (Ghana and Ivory Coast), west-central tropical Africa (Gulf of Guinea islands and the Democratic Republic of the Congo), northeast tropical Africa (Ethiopia), and east tropical Africa (Kenya and Uganda).  It was first described by the British botanist Robert Allen Rolfe in 1913 as "Eulophia ugandae" and later transferred to the genus "Oeceoclades" in 1976 when Leslie Andrew Garay and Peter Taylor resurrected and revised that genus.  The English botanist V.S. Summerhayes treated this species as a synonym of "O. latifolia", but Garay and Taylor noted that while the two species share a superficial resemblance in the appearance of the labellum, they are distinct in vegetative morphology.  The labellum of "O. ugandae" also has two swellings or protuberances between the lateral and midlobes, a feature that "O. latifolia" lacks.

Maerua angolensis: Maerua angolensis is a 10m tall, occasionally deciduous tree of the Capparaceae or caper family, often growing on termitaria and in thickets fringing seasonal watercourses, up to 1800m.  Though never common, it is widespread in tropical Africa and arid regions, being absent from high-rainfall regions.  It is found in Togo, Sudan, Eritrea, Senegal, Tanzania, Uganda, Chad, Ghana, Mali, Mauritania, Cameroon, Kenya, Burundi, Rwanda, Niger, Nigeria, The Gambia, Burkina Faso extending southwards into Angola, Malawi, Zambia, Zimbabwe, Caprivi Strip, Botswana, Namibia, South Africa, Swaziland and Mozambique.  The genus comprises some 57 species, mostly in tropical Africa, but also extending into the Middle East and tropical Asia.

Oeceoclades saundersiana: Oeceoclades saundersiana is a terrestrial orchid species in the genus "Oeceoclades" that is native to a large area in tropical Africa.  It can be found in west tropical Africa (Benin, Ghana, Guinea, Ivory Coast, Liberia, Nigeria, and Sierra Leone), west-central tropical Africa (Central African Republic, Cameroon, Equatorial Guinea, Gabon, the Gulf of Guinea islands, Rwanda, and Democratic Republic of the Congo), northeast tropical Africa (Ethiopia), east tropical Africa (Kenya, Tanzania, and Uganda), and south tropical Africa (Angola and Zambia).  It was first described by the German botanist Heinrich Gustav Reichenbach in 1866 as "Eulophia saundersiana".  It was later transferred to the genus "Oeceoclades" in 1976 by Leslie Andrew Garay and Peter Taylor.  Garay and Taylor noted that "O. saundersiana" has a labellum with four lobes of equal size and the pseudobulb is long and cylindrical with two leaves.

Euphorbiaceae: The Euphorbiaceae, the spurge family, is a large family of flowering plants.  In common English, they are sometimes called euphorbias, which is also the name of a genus in the family.  Most spurges such as "Euphorbia paralias" are herbs, but some, especially in the tropics, are shrubs or trees, such as "Hevea brasiliensis".  Some, such as "Euphorbia canariensis", are succulent and resemble cacti because of convergent evolution.  This family occurs mainly in the tropics, with the majority of the species in the Indo-Malayan region and tropical America a strong second.  A large variety occurs in tropical Africa, but they are not as abundant or varied as in the two other tropical regions.  However, Euphorbiaceae also has many species in nontropical areas such as the Mediterranean Basin, the Middle East, South Africa, and the southern United States.

Borassus aethiopum: Borassus aethiopum is a species of "Borassus" palm from Africa.  In English it is variously referred to as African fan palm, African palmyra palm, deleb palm, ron palm, toddy palm, black rhun palm, ronier palm (from the French).  It is widespread across much of tropical Africa from Senegal to Ethiopia and south to northern South Africa, though it is largely absent from the forested areas of Central Africa and desert regions such as the Sahara and Namib.  This palm also grows in northwest Madagascar and the Comoros.

Oxalis: Oxalis is a large genus of flowering plants in the wood-sorrel family Oxalidaceae comprising about 800 of the 900 known species in the family.  The genus occurs throughout most of the world, except for the polar areas; species diversity is particularly rich in tropical Brazil, Mexico and South Africa.

Gladiolus dalenii: Gladiolus dalenii is one of the most widely distributed species of gladiolus, ranging from eastern South Africa and Madagascar throughout tropical Africa and into western Arabia.  It is the main parental species of the large flowering grandiflora hybrids.  This species is also unusual in its genus in including diploid, tetraploid and hexaploid races.  The hybrids produced from it are often tetraploids.

Supporting paragraphs: Kigelia Cyclamen
Answer: Kigelia