Question: Which is cultivated across more continents, Clintonia or Washingtonia? 

full_context: Document 1: Copernicia: Copernicia is a genus of palms, native to South America and the Greater Antilles. Of the known species and nothospecies (hybrids), 22 of the 27 are endemic to Cuba. They are fan palms (Arecaceae tribe Corypheae), with the leaves with a bare petiole terminating in a rounded fan of numerous leaflets. The species are small to medium-sized trees growing to 5-30 m tall, typically occurring close to streams and rivers in savanna habitats.Govaerts, R. & Dransfield, J. (2005). World Checklist of Palms: 1-223. The Board of Trustees of the Royal Botanic Gardens, Kew.
Document 2: 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 3: Clinton Group: The Clinton Group (also referred to as the Clinton Formation or the Clinton Shale) is a mapped unit of sedimentary rock found throughout eastern North America. The interval was first defined by the geologist Lardner Vanuxem, who derived the name from the village of Clinton in Oneida County, New York where several well exposed outcrops of these strata can be found. The Clinton Group and its lateral equivalents extend throughout much of the Appalachian Foreland Basin, a major structural and depositional province extending from New York to Alabama. The term has been employed in Kentucky, Maryland, Michigan, New York, Ohio, Pennsylvania, Tennessee, Virginia, and West Virginia, though in many of these areas the same interval is referred to as the Rose Hill, Rockwood, or Red Mountain Formations. Historically the term "Clinton" has also been assigned to several lower Silurian stratigraphic units in Ohio and Kentucky which are now known to be significantly older than the Clinton Group as it was originally defined. Many parts of this succession are richly fossiliferous, making the Clinton Group an important record of marine life during the early Silurian. Several economically valuable rock-types are found within this interval, though it is perhaps best known as a significant source of iron ore
Document 4: Washingtonia: Washingtonia is a genus of palms, native to the southwestern United States (in southern California, southwest Arizona, (Nevada) Texas) and northwest Mexico (in northern Baja California and Sonora). Both "Washingtonia" species are commonly cultivated across the Southern United States, the Middle East, southern Europe, and north Africa, where they have greatly hybridized.
Document 5: Brahea: Brahea is a genus of palms in the Arecaceae family. They are commonly referred to as Hesper Palms and are endemic to Mexico and Central America. All Hesper Palms have large, fan-shaped leaves.
Document 6: Phoenix (plant): Phoenix is a genus of 14 species of palms, native to an area starting from the Canary Islands in the west, across northern and central Africa, to the extreme southeast of Europe (Crete), and continuing throughout southern Asia from Turkey east to southern China and Malaysia. The diverse habitats they occupy include swamps, deserts, and mangrove sea coasts. Most "Phoenix" species originate in semiarid regions, but usually occur near high groundwater levels, rivers, or springs. The genus is unusual among members of the subfamily Coryphoideae, with it and "Arenga" being the only ones with pinnate, rather than palmate leaves.
Document 7: Nolina microcarpa: Nolina microcarpa is a species of flowering plant in the asparagus family known by the common names sacahuista and palmilla. Like other species of "Nolina", it may be called beargrass. It is native to northern Mexico and the southwestern United States in Arizona and New Mexico. It does occur in the southwestern corner of Utah, where it has a limited distribution on Navajo Sandstone, but reports of it occurring in Texas may be in error.
Document 8: Attalea (palm): Attalea is a large genus of palms native to Mexico, the Caribbean, Central and South America. This pinnately leaved, non-spiny genus includes both small palms lacking an aboveground stem and large trees. The genus has a complicated taxonomic history, and has often been split into four or five genera based on differences in the male flowers. Since the genera can only be distinguished on the basis of their male flowers, the existence of intermediate flower types and the existence of hybrids between different genera has been used as an argument for keeping them all in the same genus. This has been supported by a recent molecular phylogeny.
Document 9: Collinsonia: Collinsonia is a genus of flowering plants in the family Lamiaceae. It is native to East Asia and eastern North America. It was named for the English botanist Peter Collinson (1694–1768) by Carl Linnaeus in "Species Plantarum" in 1753. It is in the tribe Elsholtzieae, a small tribe of only 5 genera. In order of their number of species, they are "Elsholtzia", "Mosla", "Collinsonia", "Perilla", and "Perillula".
Document 10: Clintonia: Clintonia is a genus of flowering plants first described as a genus in 1818. It is distributed across North America and eastern Asia where it is found as an understory plant in woodlands. It was named after De Witt Clinton, an 18th-century botanist and U.S. politician.
Document 11: Dryopteris clintoniana: Dryopteris clintoniana, commonly known as Clinton's wood fern, is a fern of hybrid origin native to the northern hemisphere. It is a fertile hexaploid, arising as a species by doubling of its chromosome number from a hybrid between "Dryopteris cristata", a tetraploid, and "Dryopteris goldiana", a diploid. It is more northern in its range than either parent species.
Document 12: Mesquite: Mesquite is the common name for the genus "Prosopis", containing over 40 species of small leguminous trees. They are native to the southwestern United States and Mexico (even the creeping mesquite, which is invasive in southern California).
Document 13: Clinton Houses: Governor DeWitt Clinton Houses, also known as DeWitt Clinton Houses or Clinton Houses, is a public housing development built and maintained by the New York City Housing Authority (NYCHA) in the Spanish Harlem neighborhood of Manhattan. The development is named after DeWitt Clinton (1769-1828), who served as Mayor of New York City and Governor of New York. As mayor, Clinton fought for free public education, to remove voting restrictions from Catholics, and public welfare. As governor, he helped found the New York public school system, and introduced a bill into the New York State Senate to build a canal connecting the Northeastern United States with the Great Lakes via Lake Erie.
Document 14: Clivia: Clivia is a genus of monocot flowering plants native to southern Africa. They are from the family Amaryllidaceae, subfamily Amaryllidoideae. Common names are "Natal lily" or "bush lily".
Document 15: Clivia miniata: Clivia miniata (Natal lily, bush lily, Kaffir lily) is a species of flowering plant in the genus "Clivia" of the family Amaryllidaceae, native, growing in woodland habitats in South Africa (Eastern Cape, Mpumalanga and KwaZulu-Natal provinces) as well as in Swaziland. Given suitable conditions it grows into large clumps and is surprisingly water wise. It is also reportedly naturalized in Mexico. It is a popular plant for shady areas and is commonly seen growing in older established suburbs in most Australian states. It is also popular in New Zealand, Japan, China and southern parts of the USA , particularly California.
ground_truth: Washingtonia