Question: Which genus contains more species, Berkheya or Rajania?

full_context: Document 1: Roystonea regia: Roystonea regia, commonly known as the Cuban royal palm or the Florida royal palm is a species of palm which is native to Mexico and parts of Central America and the Caribbean. A large and attractive palm, it has been planted throughout the tropics and subtropics as an ornamental tree. Although it is sometimes called "R. elata", the conserved name "R. regia" is now the correct name for the species. Populations in Cuba and Florida were long seen as separate species, but are now considered to belong to a single species.
Document 2: Renealmia alpinia: Renealmia alpinia is a flowering plant species native to the Americas, where it grows from southern Mexico through much of South America, though not in the Southern Cone. It can also be found on several Caribbean islands.
Document 3: Cynareae: The Cynareae are a tribe of flowering plants in the daisy family (Asteraceae) and the subfamily Carduoideae. Most of them are commonly known as thistles; four of the best known genera are "Carduus", "Cynara" (containing the widely eaten artichoke), "Cirsium", and "Onopordum".
Document 4: Barkleyanthus: Barkleyanthus is a monotypic genus. of flowering plants in the aster family, Asteraceae, containing the single species Barklyanthus salicifolius, a plant formerly classified in the genus "Senecio" It is native to North and Central America, where its distribution extends from the southwestern United States to El Salvador. Its common names include willow ragwort, willow groundsel, Barkley's-ragwort, and jarilla.
Document 5: Rajania: Rajania is a genus of plants in the Dioscoreaceae. It is native to the West Indies, with 14 of the 17 known species found in Cuba.
Document 6: Dioscorea orangeana: Dioscorea orangeana, is a tuberous vining flowering plant in the genus "Dioscorea", endemic the Forêt d’Orangea near Antsiranana in Madagascar, from which it derives its name. The tuber is possibly edible, and unlike most other "Dioscorea" species, the tuber has many finger-like lobes as opposed to a single tuber. Because the plant is new to science and the possible harvesting by local populations, the conservation status of "Dioscorea orangeana" is of great concern.
Document 7: Centaurea: Centaurea ( ) is a genus of between 350 and 600 species of herbaceous thistle-like flowering plants in the family Asteraceae. Members of the genus are found only north of the equator, mostly in the Eastern Hemisphere; the Middle East and surrounding regions are particularly species-rich. Common names for this genus are centaury, centory, starthistles, knapweeds, centaureas and the more ambiguous "bluets"; a vernacular name used for these plants in parts of England is "loggerheads" (common knapweed). The "Plectocephalus" group – possibly a distinct genus – is known as basketflowers. "Cornflowers" is used for a few species, but that term more often specifically means "C. cyanus" (sometimes also called "basket flower"). The common name "centaury" is sometimes used, although this also refers to the unrelated plant genus "Centaurium".
Document 8: Berkheya: Berkheya is a genus of flowering plants in the aster family, Asteraceae, and the subfamily Carduoideae, the thistles. It is distributed in tropical Africa, especially in southern regions. Of about 75 species, 71 can be found in South Africa.
Document 9: Roystonea stellata: Roystonea stellata is a species of palm endemic to Yagruma terrace in the Maisí region of Guantánamo Province in eastern Cuba. The species is known from only a single collection made by French-born botanist Frère León in 1939, and may be extinct.
Document 10: Carduus: Carduus is a genus of flowering plants in the aster family, Asteraceae, and the tribe Cynareae, one of two genera considered to be true thistles, the other being "Cirsium". Plants of the genus are known commonly as plumeless thistles. They are native to Eurasia and Africa, and several are known elsewhere as introduced species. This genus is noted for its disproportionately high number of noxious weeds compared to other flowering plant genera.
Document 11: Cyrtandra (plant): Cyrtandra is a genus of flowering plants containing about 600 species, with more being discovered often, and is thus the largest genus in the family Gesneriaceae. These plants are native to Southeast Asia, Australia, and the Pacific Islands, with the centre of diversity in Southeast Asia and the Malesian region. The genus is common, but many species within it are very rare, localized, endangered endemic plants. The species can be difficult to identify because they are highly polymorphic and because they readily hybridize with each other. The plants may be small herbs, vines, shrubs, epiphytes, or trees. The genus is characterized in part by having two stamens, and most species have white flowers, with a few red-, orange-, yellow- and pink-flowered species known. Almost all species live in rainforest habitats.
Document 12: Berberidaceae: The Berberidaceae are a family of 14 genera flowering plants commonly called the barberry family. This family is in the order Ranunculales. The family contains about 700 known species, of which the majority are in "Berberis". The species include trees, shrubs and perennial herbaceous plants.
Document 13: Roystonea dunlapiana: Roystonea dunlapiana, commonly known as yagua or cabiche is a species of palm which is native to Nicaragua, Honduras, and southern Mexico (Chiapas, Campeche, Quintana Roo, Tabasco, Veracruz). It is the only species in the genus "Roystonea" which is absent from the insular Caribbean.
Document 14: Roystonea: Roystonea is a genus of eleven species of monoecious palms, native to the Caribbean Islands, and the adjacent coasts of Florida and Central and northern South America. Commonly known as the royal palms, the genus was named for Roy Stone, a U.S. Army engineer. It contains some of the most recognizable and commonly cultivated palms in tropical and subtropical regions.
Document 15: Brachystelma: The genus Brachystelma R. Br. (Apocynaceae: Asclepiadoideae - Ceropegieae) is represented by over a hundred species in the world, chiefly distributed in South Africa, South-East Asia and Australasia. In India, 17 species are known to occur, of which nine are endemic.
ground_truth: Berkheya