Question: Of the two flowering plants Eriogonum and Ascocenda, is one natural and the other man-made?

full_context: Document 1: Hybrid orangutan: A hybrid orangutan or cocktail orangutan is a usually captive-born orangutan derived from interbreeding between Bornean ("Pongo pygmaeus") and Sumatran ("Pongo abelii") orangutans. The topic of orangutan speciation was poorly understood until the 1980s, when genetics revealed that orangutans actually comprise these two genetically distinct species. Before this was known, orangutans from differing species were paired in captivity, and in some cases produced hybrid offspring. Subsequently, the government of Indonesia and the organization that oversees zoo programs in the United States suggested to stop interbreeding of Sumatran and Bornean orangutans and called for disallowing hybrids to reproduce.
Document 2: Ascocenda: × Ascocenda, abbreviated as Ascda in the horticultural trade, is a man-made hybrid orchid genus resulting from a cross between "Ascocentrum" and "Vanda" (Asctm × V). It was first described in Orchid Rev. 57: 172 (1949).
Document 3: Polygonum californicum: Polygonum californicum is a species of flowering plant in the buckwheat family known by the common name California knotweed. It is native to the west coast of the United States from Washington, Oregon, and northern and central California in the Coast Ranges and Sierra Nevada foothills as far south as Napa and Tulare Counties. It can be found in many types of open habitats.
Document 4: Eriocaulon: Eriocaulon is a genus of about 400 species commonly known as pipeworts, of monocotyledonous flowering plants in the family Eriocaulaceae. The genus is widely distributed, with the centers of diversity for the group occurring in tropical regions, particularly southern Asia and the Americas. A few species extend to temperate regions, with ca. 10 species in the United States, mostly in the southern states from California to Florida, and only two species in Canada; China has 35 species, also mostly southern. Only one species ("E. aquaticum") occurs in Europe, where it is confined to the Atlantic Ocean coasts of Scotland and Ireland; this species also occurs in eastern North America and is thought to be a relatively recent natural colonist in Europe. In the Americas, "Eriocaulon" is the only genus in its family that occurs north of Florida. They tend to be associated with wet soils, many growing in shallow water, in wetlands, or in wet savannas like flatwoods. In wet soils, their abundance appears to be related to water levels, fire frequency, and competition from other plants such as grasses. Experiments have shown that they are weak competitors compared to many other wetland plant species. Some species can persist as buried seeds during unfavorable conditions. The scientific name is derived from Ancient Greek εριον, "erion", meaning 'wool', and καυλός, "caulos", meaning 'stalk'.
Document 5: Angraecum: The genus Angraecum, abbreviated as Angcm in horticultural trade, common name Angrek (Indonesian and Malay) or Comet Orchid, contains about 220 species.
Document 6: Polygonum erectum: Polygonum erectum is a North American species of annual plant species in the buckwheat family, with upright or ascending stems, called erect knotweed. It was once cultivated for food by Native Americans as part of the group of crops known as the Eastern Agricultural Complex. It is found primarily in the northeastern and north-central parts of the United States, but with scattered populations in other parts of the US and also in Canada.
Document 7: Catasetum: Catasetum, abbreviated as Ctsm in horticultural trade, is a genus of showy epiphytic Orchids, family Orchidaceae, subfamily Epidendroideae, tribe Cymbidieae, subtribe Catasetinae, with 166 species, many of which are highly prized in horticulture.
Document 8: Catawbiense hybrid: A catawbiense hybrid is a hybrid of the plant genus "Rhododendron", derived from crosses of American species "Rhododendron catawbiense" and "Rhododendron maximum" with European and Asian species "R. arboreum", "R. caucaseum" and "R. ponticum".
Document 9: Eriogonum inflatum: Eriogonum inflatum, the desert trumpet, is a perennial plant of the family Polygonaceae. The plant possesses very small yellow or pink flowers and an inflated stem just below branching segments. Eriogonum: from the Greek "erion", "wool", and "gonu", "joint or knee", in reference to the hairy or woolly joints of some of the species of the genus, but not particularly "inflatum". It is found in the Mojave Desert and other deserts.
Document 10: Eriogonum: Eriogonum is the scientific name for a genus of flowering plants in the family Polygonaceae. The genus is found in North America and is known as wild buckwheat. This is a highly species-rich genus, and indications are that active speciation is continuing. It includes some common wildflowers such as the California buckwheat ("Eriogonum fasciculatum").
Document 11: Phalaenopsis: Phalaenopsis , known as moth orchids, abbreviated Phal in the horticultural trade, is an orchid genus of approximately 60 species. "Phalaenopsis" is one of the most popular orchids in the trade, through the development of many artificial hybrids. It is native to southern China, Taiwan, the Indian Subcontinent, Southeast Asia (Thailand, Philippines, Malaysia, Indonesia, etc.), New Guinea, the Bismarck Archipelago, and Queensland.
Document 12: Eriogonum gilmanii: Eriogonum gilmanii is a species of wild buckwheat known by the common name Gilman's buckwheat. This plant is endemic to Inyo County, California, where it is known only from the desert mountain slopes of the Cottonwood, Last Chance, and Panamint Ranges. This is a flat mat-forming, woody perennial herb which grows in patches under 20 centimeters wide on rocky soils. Its tiny fleshy leaves, each under half a centimeter wide, are covered in a dense hairy white wool. The plant blooms in showy erect heads of small, inflated flowers, each a few millimeters wide and yellowish or orange with red stripes.
Document 13: Eriogonum codium: Eriogonum codium is a species of wild buckwheat known by the common names basalt desert buckwheat and Umtanum Desert wild buckwheat. It is endemic to Washington in the United States, where it is known only from Hanford Reach National Monument in Benton County. It was discovered in 1995 during an inventory of the biodiversity of the monument and described to science in 1997.
Document 14: Brassocattleya: Brassocattleya or Brasso-cattleya, abbreviated Bc. in the horticultural trade, is an intergeneric orchid hybrid derived from the genera "Brassavola" and "Cattleya".
Document 15: Polygonum sawatchense: Polygonum sawatchense is a North American species of plants in the buckwheat family. It in the western United States and western Canada, from the Pacific Coast to the western Great Plains, so from British Columbia south to California and east as far as New Mexico, Colorado, Saskatchewan, and the Dakotas.
ground_truth: yes