Question: Of the genuses Eccremocarpus and Gomphocarpus, which plants are native to South America?

Context paragraphs:
Austroeupatorium: Austroeupatorium is a genus of plants native primarily to South America, including herbaceous perennials and shrubs.  The native range is focused on eastern South America and extends as far north as Panama and Trinidad and as far west as Bolivia.

Invasive species in South America: Invasive species are a serious threat to the native biodiversity of South America and are an ongoing cost to South American agriculture.  South America is an important region for the worlds biodiversity, and includes a wide variety of native species, many of which provide .  Introduced species in South America, have the potential to pose harm to ecosystems of the region and the aforementioned biodiversity.  Although many of these non-native species are invasive, residents of the region often value these species, making it more difficult to organize efforts to get rid of them.  Because of the instrumental and cultural value placed on these species, greater awareness, research, and policy are all necessary steps in solving invasive issues in South America.  Here is a list of just a few of the species that have invaded South America and where they originate.

List of South American mammals: This is a list of the native wild mammal species recorded in South America.  South America's terrestrial mammals fall into three distinct groups.  The marsupials and xenarthrans are 'old-timers', their ancestors having been present on the continent since at least the very early Cenozoic Era.  During the early Cenozoic, South America's only land connection was to Antarctica, so it was effectively cut off from most of the world; as the fragments of Gondwana continued to separate, this connection was lost, leaving South America an island continent.  Caviomorph rodents and monkeys arrived as 'waif dispersers' by rafting across the Atlantic from Africa in the Eocene epoch, 35 million or more years ago.  All the remaining nonflying mammals of South America are recent arrivals, having migrated from North America via Central America during the past seven million years as part of the Great American Interchange; this invasion, which peaked around three million years ago, was made possible when the formation of the volcanic Isthmus of Panama bridged North and South America.  The newcomers out-competed and drove to extinction many unique mammals that had evolved during South America's long period of isolation, as well as some species from other classes (e.g., terror birds).

Arachis: Arachis is a genus of about 70 species of annual and perennial flowering plants in the pea family (Fabaceae), native to South America, and was recently assigned to the informal monophyletic "Pterocarpus" clade of the Dalbergieae.  At least one species, the peanut ("Arachis hypogaea"), is a major food crop species of global importance; some of the other species are cultivated for food to a small extent in South America.  Other species such as "A. pintoi" are cultivated worldwide as forage and soil conditioner plants, with the leaves providing high-protein feed for grazing livestock and a nitrogen source in agroforestry and permaculture systems.

Nops (spider): Nops is a genus of medium-sized caponiid spider native to South America, Central America, and the Caribbean islands.  The genus currently counts 27 extant species plus one fossil in Dominican amber, but probably the real number of extant species is greater.  "Nops" have a great richness on the Caribbean islands (14 species).  Even species of Central America (4) and South America (15) are located in high proportion toward the area of the Caribbean Sea.  Most species of South America are known only from the coast of Colombia and Venezuela, including the islands of Aruba, Curaçao, Bonaire and Trinidad.  The genus is not revised yet, but apparently have a Neotropical distribution.

Gustavia (plant): Gustavia is a genus of flowering plants of Lecythidaceae family described by Linnaeus in 1775.  It is native to tropical Central America and South America.  Many of the species are threatened; some are critically endangered "Gustavia superba", though, is actually abundant in re-growing secondary forests.  It grows in northern South America, from Panama south through the Andes as far as Ecuador, and along the Caribbean coast and in the Amazon basin.

Alternanthera philoxeroides: Alternanthera philoxeroides, commonly referred to as alligator weed, is a native species to the temperate regions of South America, which includes Argentina, Brazil, Paraguay and Uruguay.  Argentina alone, hosts around 27 species that fall within the range of the genus Alternanthera.  Its geographic range once used to cover only the Parana River region of South America, but it has since expanded to cover over 30 countries, such as the United States, New Zealand, China and many more.  This invasive species is believed to have been accidentally introduced to these non-native regions through sediments trapped/attached to tanks and cargo of ships travelling from South America to these various areas.

Eccremocarpus: Eccremocarpus (syn.  "Calampelis" D.Don) is a genus of five species of flowering plants in the family Bignoniaceae, native to western South America in Chile, western Argentina, and Peru.  The species are evergreen semi-woody vines growing to 1-7 m tall.

Gomphocarpus: Gomphocarpus is a genus of milkweeds first described as a genus in 1810.  It is widespread across much of Africa, with a few species naturalized in other regions.

Galictis: A grison, also known as a South American wolverine, is any mustelid in the genus Galictis.  Native to Central and South America, the genus contains two extant species: the greater grison ("Galictis vittata"), which is found widely in South America, through Central America to southern Mexico; and the lesser grison ("Galictis cuja"), which is restricted to the southern half of South America.  In Spanish it is referred to as a "huroncito" (literally "little ferret") or "grisón" and in Portuguese as a "furão".

Supporting paragraphs: Eccremocarpus Gomphocarpus
Answer: Eccremocarpus