Question: Which eastern African country is the native country of flowering plant Multidentia castaneae?

Context articles: Ludwigia octovalvis
Wildlife of India
Tanzania
Geothermal power in Kenya
Refugees of South Sudan
Togo Mountains
Cassava brown streak virus
Stapelia gigantea
Multidentia castaneae
Pleiospilos bolusii

Ludwigia octovalvis is a species of flowering plant in the evening primrose family known by the common name Mexican primrose-willow.
 Its native distribution is unclear, but can be found in Central America, Australia, South-East Asia, the Middle East, the Central-West African regions and spreads easily to become naturalized.
 It is also cultivated as an aquatic plant.
 The plant is known for its anti-ageing properties.
 The species is sometimes regarded as an invasive species and is classified by IUCN as of Least Concern with stable populations.
 An adult plant is one meter tall on average but is able to grow taller.
 and spreads to form mats on the mud, rooting at nodes in contact with the substrate, or floats ascending in the water.
 Its flowers are yellow in appearance.
 They are made up of green and red stems.
 They yield small capsular fruits containing many minute seeds.
India boasts a variety of species and organisms.
 Apart from a handful of the major farm animals such as cows, buffaloes, goats, chickens, and camels, India has an amazingly wide spectrum of animals native to the country.
 It is home to Bengal and Indochinese tigers, Indian lions, deer, pythons, wolves, foxes, bears, crocodiles, wild dogs, monkeys, snakes, antelope species, varieties of bison and the Asian elephant.
 The region's rich and diverse wildlife is preserved in 120+ national parks, 18 Bio-reserves and 500+ wildlife sanctuaries across the country.
 India has some of the most biodiverse regions of the world and hosts four of the world’s 35 biodiversity hotspots – or treasure-houses – that is the Western Ghats, the Eastern Himalayas, Indo-Burma and Nicobar islands in Sundaland.
 Since India is home to a number of rare and threatened animal species, wildlife management in the country is essential to preserve these species.
 India is one of the seventeen megadiverse countries.
 According to one study, India along with other 16 mega diverse countries is home to about 60-70% of the world's biodiversity.
 India, lying within the Indomalaya ecozone, is home to about 7.6% of all mammalian, 12.6% of avian (bird), 6.2% of reptilian, and 6.0% of flowering plant species.
Tanzania ( ), officially the United Republic of Tanzania (Swahili: "Jamhuri ya Muungano wa Tanzania" ), is a country in eastern Africa within the African Great Lakes region.
 It borders Kenya and Uganda to the north; Rwanda, Burundi, and the Democratic Republic of the Congo to the west; Zambia, Malawi, and Mozambique to the south; and the Indian Ocean to the east.
 Mount Kilimanjaro, Africa's highest mountain, is in north-eastern Tanzania.
Geothermal power is very cost-effective in the Great Rift Valley of Kenya, East Africa.
 Kenya was the first African country to build geothermal energy sources.
 The Kenya Electricity Generating Company, which is 74% state-owned, has built three plants to exploit the Olkaria geothermal resource, Olkaria I (195 MW), Olkaria II (105 MW) and Olkaria IV (150 MW, 75 MW Wellhead generation plants, with a third private plant Olkaria III (139 MW).
 Additionally, a pilot wellhead plant of 2.5 MW has been commissioned at Eburru and two small scale plants have been built by the Oserian Development Company to power their rose farm facilities with a total of 4 MW.
 Kenya currently has 636 MW of installed geothermal capacity.
South Sudanese refugees are persons originating from the African country of South Sudan, but seeking refuge outside the borders of their native country.
 The world's youngest independent country has a recent and troubled history of prolonged conflicts and climate change, namely desertification.
 These forces have resulted not only in violence and famine, but also the forced migration of large numbers of the population, both inside and outside the country's borders.
The Togo Mountains is a mountain range which stretches across the central region of the West African country of Togo and across the eastern and western borders of that country into Ghana and Benin.
 In Ghana, the range is also known as the Akwapim Hills, and in Benin it is also known as the Atakora Mountains.
 Part of the range is associated with the country of Niger, where the W National Park is found.
 The African wild dog, "Lycaon pictus", was historically found in this region but may now be extirpated from this locale.
Cassava brown streak virus (CBSV) was first described in the former Tanganyika territory of East Africa, now Tanzania 70 years ago.
 An endemic viral outbreak progressed throughout the Eastern African coastal cassava-growing areas from Southern Kenya, through Tanzania to the Zambezi river in Mozambique.
 Cassava, a tuberous, starch-rich plant ("Manihot esculenta) "has remained a staple food crop among countries of sub-Saharan Africa for many years, and is a primary food source for many families.
 Loss of such crops has a large effect on food sources and economic stability;however, the extent of the loss cannot be fully determined until the crop is harvested.
 Transmission is most commonly attributed to whiteflies (two whitefly species, "Bemisia afer" (Priesner & Hosny) and "Bemisia tabaci" (Gennadius)).
 Disease spread can be rapid, resulting in incidences exceeding 50% in some coastal regions of Tanzania and Mozambique.
 CBSV and other related virus strains are responsible for up to $100 million USD in losses each year in Africa due to crop destruction.
Stapelia gigantea is a species of flowering plant in the family Apocynaceae, native to south eastern Africa.
 Growing up to tall, it is a clump-forming succulent with erect green stems 3 cm thick.
 In summer, it bears large star-shaped five-petalled flowers up to 25 cm in diameter.
 The flowers are red and yellow, wrinkled, with a silky texture and fringed with hairs, that can be as long as .
 They have the smell of rotting flesh, in order to attract the flies which pollinate them.
 Despite the foul odor of its flower, "S. gigantea" can act as an appetite suppressant in humans.
 The plant is commonly referred to as Zulu giant, carrion plant or toad plant (although the name "carrion plant" can also refer to "Stapelia grandiflora").
 "Stapelia gigantea" sometimes also goes by the name of "Stapelia nobilis" or "Stapelia marlothii".
Multidentia castaneae is a species of flowering plants in the family Rubiaceae.
 It is endemic to Tanzania.
Pleiospilos bolusii (mimicry plant) is a species of flowering plant in the family Aizoaceae, native to the Eastern Cape of South Africa, where it grows at an altitude of 750 - .
 The species epithet "bolusii" honors Harry Bolus, a 19th-century South African botanist.