Question: Which flowering tree genus is commonly grown as ornamentals in warm regions, Plumeria or Vitex?

full_context: Document 1: Vitaceae: The Vitaceae are a family of dicotyledonous flowering plants, with 14 genera and ca 910 known species, including the grapevine and Virginia creeper. The family name is derived from the genus "Vitis". The name sometimes appears as Vitidaceae, but Vitaceae is a conserved name and therefore has priority over both Vitidaceae and another name sometimes found in the older literature, Ampelidaceae. In the APG III system (2009) onwards, the family is placed in its own order, Vitales. Molecular phylogenetic studies place the Vitales as the most basal clade in the rosids.
Document 2: Plumeria: Plumeria ( ) is a genus of flowering plants in the dogbane family, Apocynaceae. Most species are deciduous shrubs or small trees. The species variously are indigenous to Mexico, Polynesia, Central America, and the Caribbean, and as far south as Brazil, but are grown as cosmopolitan ornamentals in warm regions. Common names for plants in the genus vary widely according to region, variety, and whim, but frangipani or variations on that theme are the most common. Plumeria also is used directly as a common name, especially in horticultural circles.
Document 3: Thevetia: Thevetia is a genus of flowering plants in the dogbane family, Apocynaceae, first described for modern science as a genus in 1758. It is native to Mexico, Central America, South America, and Cuba. The taxonomy of the genus is controversial, with some authors including "Cascabela" within "Thevetia", while others accept the two genera as separate.
Document 4: Vitex agnus-castus: Vitex agnus-castus, also called vitex, chaste tree, chasteberry, Abraham's balm, lilac chastetree, or monk's pepper, is a native of the Mediterranean region. It is one of the few temperate-zone species of "Vitex", which is on the whole a genus of tropical and sub-tropical flowering plants. Theophrastus mentioned the shrub several times, as "agnos" (άγνος) in "Enquiry into Plants". It has been long believed to be an anaphrodisiac but its effectiveness remains controversial. This is a cross-pollinating plant. However self-pollination may also occur now and then.
Document 5: Vicia: Vicia is a genus of about 140 species of flowering plants that are part of the legume family (Fabaceae), and which are commonly known as vetches. Member species are native to Europe, North America, South America, Asia and Africa. Some other genera of their subfamily Faboideae also have names containing "vetch", for example the vetchlings ("Lathyrus") or the milk-vetches ("Astragalus"). The broad bean ("Vicia faba") is sometimes separated in a monotypic genus "Faba"; although not often used today, it is of historical importance in plant taxonomy as the namesake of the order Fabales, the Fabaceae and the Faboideae. The tribe Vicieae in which the vetches are placed is named after the genus' current name. Among the closest living relatives of vetches are the lentils ("Lens") and the true peas ("Pisum").
Document 6: Vitex: Vitex is a genus of flowering plants in the family Lamiaceae. It has about 250 species. Common names include "chastetree", traditionally referring to "V. agnus-castus" but often applied to other species as well.
Document 7: Privet: A privet is a flowering plant in the genus Ligustrum. The genus contains about 50 species of erect, deciduous or evergreen shrubs, sometimes forming small or medium-sized trees, native to Europe, north Africa, Asia, many introduced and naturalised in Australasia, where only one species extends as a native into Queensland. Some species have become widely naturalized or invasive where introduced. "Privet" was originally the name for the European semi-evergreen shrub "Ligustrum vulgare", and later also for the more reliably evergreen "Ligustrum ovalifolium" used extensively for privacy hedging, though now the name is applied to all members of the genus. The generic name was applied by Pliny the Elder (23–79 CE) to "L. vulgare". It is often suggested that the name "privet" is related to "private", but the OED states that there is no evidence to support this.
Document 8: Vitex negundo: Vitex negundo, commonly known as the Chinese chastetree, five-leaved chaste tree, or horseshoe vitex, is a large aromatic shrub with quadrangular, densely whitish, tomentose branchlets. It is widely used in folk medicine, particularly in South and Southeast Asia.
Document 9: Hymenosporum: Hymenosporum flavum, or native frangipani, is a rainforest tree which is native to Queensland and New South Wales in Australia and New Guinea. It is the sole species within the genus Hymenosporum, and is closely related to the widespread genus Pittosporum.
Document 10: Plumeria obtusa: Plumeria obtusa, the Singapore graveyard flower, is a species of the genus "Plumeria" (Apocynaceae). It is native to the West Indies including Bahamas; southern Mexico, Belize, Guatemala, and Florida. but widely cultivated for its ornamental and fragrant flowers around the world, where suitably warm climate exists. It is reportedly naturalized in China.
Document 11: Vitex rotundifolia: Vitex rotundifolia, the roundleaf chastetree or beach vitex is a species of "Vitex" that is native to seashores throughout the Pacific. Its range includes continents and islands stretching from India east to Hawaii and from Korea south to Australia. This woody perennial plant typically grows approximately 1 m in height. It has a sprawling growth habit and produces runners that root regularly at nodes. This rooting pattern allows the plant to spread rapidly. At maturity, "V. rotundifolia" produces blue-purple flowers that are borne in clusters and ultimately yield small brown-black fruits. Its leaves are rounded at the tips with green upper surfaces and silver lower surfaces. While the plant is a seashore obligate, it grows over a wide latitude range. It has been used for medicinal purposes throughout its native range. More recently, it was imported to the eastern United States where it has become a seashore invasive. Control efforts are presently underway to protect the fragile beach dune ecosystem.
Document 12: Lavandula: Lavandula (common name lavender) is a genus of 47 known species of flowering plants in the mint family, Lamiaceae. It is native to the Old World and is found from Cape Verde and the Canary Islands, Europe across to northern and eastern Africa, the Mediterranean, southwest Asia to southeast India. Many members of the genus are cultivated extensively in temperate climates as ornamental plants for garden and landscape use, for use as culinary herbs, and also commercially for the extraction of essential oils. The most widely cultivated species, "Lavandula angustifolia", is often referred to as lavender, and there is a color named for the shade of the flowers of this species.
Document 13: Nerium: Nerium oleander is a shrub or small tree in the dogbane family Apocynaceae, toxic in all its parts. It is the only species currently classified in the genus Nerium. It is most commonly known as nerium or oleander, from its superficial resemblance to the unrelated olive "Olea". It is so widely cultivated that no precise region of origin has been identified, though southwest Asia has been suggested. The ancient city of Volubilis in Morocco may have taken its name from the Berber name "oualilt" for the flower. Oleander is one of the most poisonous commonly grown garden plants.
Document 14: Plumeria rubra: Plumeria rubra is a deciduous plant species belonging to the genus "Plumeria". Originally native to Mexico, Central America, Colombia and Venezuela, it has been widely cultivated in subtropical and tropical climates worldwide and is a popular garden and park plant, as well as being used in temples and cemeteries. It grows as a spreading tree to 7 – high and wide, and is flushed with fragrant flowers of shades of pink, white and yellow over the summer and autumn. Its common names include frangipani, red paucipan, red-jasmine, red frangipani, common frangipani, temple tree, or simply plumeria.
Document 15: Bauhinia divaricata: Bauhinia divaricata is a species of flowering shrub of the family Fabaceae. "B. divaricata" is the type species of the genus "Bauhinia". One common name for this species is pom pom orchid tree. It is native to China, Jamaica, India and also grows in the southern half of Florida. It has white bi-lobed leaves that alternate.
ground_truth: Plumeria