Question: What is a genus of flowering plants in the Rubiaceae family, Ardisia and Rothmannia ?

full_context: Document 1: Croton (plant): Croton is an extensive flowering plant genus in the spurge family, Euphorbiaceae. The plants of this genus were described and introduced to Europeans by Georg Eberhard Rumphius. The common names for this genus are rushfoil and croton, but the latter also refers to "Codiaeum variegatum". The generic name comes from the Greek κρότος ("krótos "), which means "tick" and refers to the shape of the seeds of certain species.
Document 2: Berberis aristata: Berberis aristata, also known as Indian barberry, "chutro" or tree turmeric, is a shrub belonging to the family Berberidaceae and the genus "Berberis". The genus comprises approximately 450-500 species of deciduous evergreen shrubs and is found in the temperate and sub-tropical regions of Asia, Europe, and America. "B. aristata" is native to the Himalayas in India and in Nepal. It is also naturally found in the wet zone of Sri Lanka.
Document 3: Corydalis: Corydalis (Greek "korydalís" "crested lark") is a genus of about 470 species of annual and perennial herbaceous plants in the Papaveraceae family, native to the temperate Northern Hemisphere and the high mountains of tropical eastern Africa. They are most diverse in China and the Himalayas, with at least 357 species in China.
Document 4: Thunbergia: Thunbergia is a genus of flowering plants in the family Acanthaceae, native to tropical regions of Africa, Madagascar and southern Asia. "Thunbergia" species are vigorous annual or perennial vines and shrubs growing to 2-8 m tall. The generic name honours Carl Peter Thunberg.
Document 5: Myrsine: Myrsine is a genus of flowering plants in the family Primulaceae. It was formerly placed in the family Myrsinaceae before this was merged into the Primulaceae. It is found nearly worldwide, primarily in tropical and subtropical areas. It contains about 200 species, including several notable radiations, such as the matipo of New Zealand and the kōlea of Hawaiʻ i (the New Zealand "black matipo", "Pittosporum tenuifolium", is not related to "Myrsine"). In the United States, members of this genus are known as colicwood. Some species, especially "M. africana", are grown as ornamental shrubs.
Document 6: Coriaria: Coriaria is the sole genus in the family Coriariaceae described by Linnaeus in 1753. It includes 14 species of subshrubs, shrubs and small trees, with a widespread but disjunct distribution across warm temperate regions of the world, occurring as far apart as the Mediterranean region, southern and eastern Asia, New Zealand (where some are alpine species), the Pacific Ocean islands, and Central and South America.
Document 7: Rothmannia: Rothmannia is a genus of flowering plants in the Rubiaceae family. It was described in 1776 and is named for Göran Rothman (1739–1778) by Thunberg – both were pupils of Linnaeus. The genus has a wide distribution area and is found tropical and southern Africa, western Indian Ocean, southern China to Indo-China and New Guinea.
Document 8: Ardisia: Ardisia (coralberry or marlberry) is a genus of flowering plants in the family Primulaceae. It was in the former Myrsinaceae family now recognised as the myrsine sub-family Myrsinoideae. They are distributed in the Americas, Asia, Australia, and the Pacific Islands, mainly in the tropics. There are 400 to 500 species.
Document 9: Rehmannia: Rehmannia is a genus of six species of flowering plants in the order Lamiales, endemic to China.
Document 10: Thonningia: Thonningia is a monotypic genus of flowering plants in the family Balanophoraceae containing the single species Thonningia sanguinea. It is distributed throughout much of southern and western Africa, particularly the tropical regions. Common names for the plant include ground pineapple. A familiar plant to humans, it has an extremely long list of common names in many African languages. Many names are inspired by the resemblance of the plant's inflorescence to a pineapple or palm tree. Some of the names can be translated as pineapple of the bush (from Anyi), duiker's kolanut (from Igala), and crown of the ground (from Yoruba).
Document 11: Ericaceae: The Ericaceae are a family of flowering plants, commonly known as the heath or heather family, found most commonly in acid and infertile growing conditions. The family is large, with c. 4250 known species spread across 124 genera, making it the 14th most species-rich family of flowering plants. The many well-known and economically important members of the Ericaceae include the cranberry, blueberry, huckleberry, rhododendron (including azaleas), and various common heaths and heathers ("Erica", "Cassiope", "Daboecia", and "Calluna" for example).
Document 12: Gesneria: Gesneria is a genus of approximately 50 species in the flowering plant family Gesneriaceae. Except for two or three odd South American species, all are native to islands of the Caribbean. The genus is classified in the tribe Gesnerieae along with the genera "Bellonia", "Pheidonocarpa", and "Rhytidophyllum". "Gesneria" species are usually woody shrubs or subshrubs, and (with the closely related "Rhytidophyllum") are unusual in the family in having alternately (rather than decussately) arranged leaves. A complete list of the accepted species and their synonyms can be found in the Smithsonian Institution's World Checklist of Gesneriaceae.
Document 13: Rotheca myricoides: Rotheca myricoides (Butterfly Bush) is a species of flowering plant in the family Lamiaceae. It is native to Africa and widely cultivated elsewhere. In cultivation, it is frequently known by one of its synonyms, such as "Clerodendrum myricoides" or "Clerodendrum myricoides" 'Ugandense'.
Document 14: Manettia: Manettia is a genus of flowering plants in the family Rubiaceae. There are between 80 and 123 species. They are distributed in the West Indies, Mexico, and Central and South America. Most are vines. The genus was named after Saverio Manetti.
Document 15: 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.
ground_truth: Rothmannia