Question: What are both Egeria and Selago?

full_context: Document 1: Selago: Selago is a genus of plant in family Scrophulariaceae, closely related to "Scrophularia" and "Verbascum". It contains around 190 species, mostly in southern Africa; two are listed on the IUCN Red List:
Document 2: 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 3: Delosperma: Delosperma ('delos'=evident, 'sperma'=seed) is a genus of around 100 species of succulent plants, formerly included in "Mesembryanthemum" in the family Aizoaceae. The family is common in southern and eastern Africa.
Document 4: Huperzia selago: Huperzia selago, the northern firmoss or fir clubmoss, is a vascular plant in the family Lycopodiaceae. It has a circumpolar distribution in temperate and boreal regions in both hemispheres. In the past, this species has also been named "Lycopodium selago".
Document 5: Mimulus: Mimulus is a plant genus in the family Phrymaceae, which was traditionally placed in family Scrophulariaceae. The genus now contains only seven species, two native to eastern North America and the other five native to Asia, Australia, Africa, or Madagascar. In the past, about 150 species were placed in this genus, most of which have since been assigned to other genera, the majority to genus "Erythranthe". "Mimulus
Document 6: Phygelius: Phygelius, common names Cape fuchsia or Cape figwort, is a genus of flowering plants in the Scrophulariaceae family, native to wet slopes and banks in southern Africa. They are evergreen shrubs often treated as perennials in colder climates. They bear many pendent tubular flowers over a long period in summer, in shades of white, yellow and red. The vague similarity of the blooms to fuchsias has led to the common name Cape fuchsia, though they are not closely related.
Document 7: Eupatorieae: Eupatorieae is a tribe of over 2000 species of plants in the aster family. Most of the species are native to tropical, subtropical, and warm temperate areas of the Americas, but some are found elsewhere. Well-known members are "Stevia rebaudiana" (used as a sugar substitute), a number of medicinal plants ("Eupatorium"), and a variety of late summer to autumn blooming garden flowers, including "Ageratum" (flossflower) and "Conoclinium" (mistflower).
Document 8: Egeria (plant): Egeria is a genus of three species of aquatic plants in the family Hydrocharitaceae described as a genus in 1849. native to warm-temperate South America.
Document 9: Silene: Silene is a genus of flowering plants in the family Caryophyllaceae. Containing approximately 700 species, it is the largest genus in the family. Common names include campion (which is shared with the related genus "Lychnis") and catchfly. Many "Silene" species are widely distributed, particularly in the northern hemisphere.
Document 10: Egeria densa: Egeria densa, the large-flowered waterweed or Brazilian waterweed, is a species of "Egeria" native to warm temperate South America in southeastern Brazil, Argentina, and Uruguay. It is considered a problematic invasive species due to its use in home aquariums and subsequent release into non-native habitats.
Document 11: Echinodorus grisebachii: Echinodorus grisebachii or Echinodorus amazonicus is commonly known as Amazon sword plant, although other plants are also known under this common name. The aquatic plant is cultivated for and used in ponds and artificial aquatic habitats. It is native to Cuba, Central America, and South America as far south as Brazil and Bolivia.
Document 12: Elodea: Elodea is a genus of 6 species of aquatic plants often called the waterweeds described as a genus in 1803. "Elodea" is native to North and South America and is also widely used as aquarium vegetation. It lives in fresh water.
Document 13: 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.
Document 14: Eugenia: Eugenia is a genus of flowering plants in the myrtle family Myrtaceae. It has a worldwide, although highly uneven, distribution in tropical and subtropical regions. The bulk of the approximately 1,000 species occur in the New World tropics, especially in the northern Andes, the Caribbean, and the Atlantic Forest (coastal forests) of eastern Brazil. Other centers of diversity include New Caledonia and Madagascar. Many species new to science have been and are in the process of being described from these regions. For example, 37 new species of "Eugenia" have been described from Mesoamerica in the past few years. At least 20 new species are currently in the process of being described from New Caledonia, and approximately the same number of species new to science may occur in Madagascar. Despite the enormous ecological importance of the myrtle family in Australia (e.g. "Eucalyptus", "Corymbia", "Angophora", "Melaleuca", "Callistemon", "Rhodamnia", "Gossia"), only one species of "Eugenia", "E. reinwardtiana", occurs on that continent. The genus also is represented in Africa south of the Sahara, but it is relatively species-poor on that continent. In the past some botanists included the morphologically similar Old World genus "Syzygium" in "Eugenia", but research by Rudolf Schmid in the early 1970s convinced most botanists that the genera are easily separable. Research by van Wyk and colleagues in South Africa suggests the genus may comprise at least two major lineages, recognizable by anatomical and other features.
Document 15: Azorella selago: Azorella selago is a species of cushion plant native to the sub-Antarctic islands of the Southern Ocean, including the Crozet Islands, the Possession Islands, the Heard Island and McDonald Islands, the Kerguelen Islands, and the Prince Edward Islands. The closely related "Azorella macquariensis", which is endemic to Macquarie Island, was split from it taxonomically in 1989. "A. selago" is often a keystone species where it occurs and is well studied for its contribution to its native ecosystems.
ground_truth: a genus of plant