Question: Concerning the genus Coffea and Echinacea, which is the most valuable?

full_context: Document 1: Euphorbia: Euphorbia is a very large and diverse genus of flowering plants, commonly called spurge, in the spurge family (Euphorbiaceae). "Euphorbia" is sometimes used in ordinary English to collectively refer to all members of Euphorbiaceae (in deference to the type genus), not just to members of the genus. Some euphorbias are commercially widely available, such as poinsettias at Christmas. Some are commonly cultivated as ornamentals, or collected and highly valued for the aesthetic appearance of their unique floral structures, such as the crown of thorns plant. Euphorbias from the deserts of Southern Africa and Madagascar have evolved physical characteristics and forms similar to cacti of North and South America, so they (along with various other kinds of plants) are often incorrectly referred to as "cacti". Some are used as ornamentals in landscaping, because of beautiful or striking overall forms, and drought and heat tolerance.
Document 2: Echinacea sanguinea: Echinacea sanguinea (sanguine purple coneflower) is a herbaceous perennial native to open sandy fields and open pine woods and prairies in eastern Texas, southeastern Oklahoma, Louisiana, and southwestern Arkansas. It is the southernmost "Echinacea" species. The specific epithet "sanguinea", which is Latin for "blood", refers to the color of the petals.
Document 3: Coffee in world cultures: Countries have cultivated coffee beans into various vehicles to satisfy needs unique to each country. Whether it be for energy, socialization, or tradition, the cultivation of coffee has served as a motivating force of the world. The modernization of coffee and its unique forms across cultures are markers of tradition and modern changes across continents. Coffee culture appears in the way in which people consume coffee, the way they make it, and where coffee is served and shared. Each of these factors combined reflects the lives of the people in these countries and the importance of coffee across the world.
Document 4: Sabiceeae: Sabiceeae is a tribe of flowering plants in the Rubiaceae family and contains about 164 species in 7 genera. Its representatives are found in tropical Africa, Madagascar, Sri Lanka, and from Mexico to tropical America. The genus "Sabicea" is one of the rare genera in Rubiaceae that occurs both in tropical Africa and tropical America.
Document 5: Coffea: Coffea is a genus of flowering plants whose seeds, called coffee beans, are used to make various coffee beverages and products. It is a member of the family Rubiaceae. They are shrubs or small trees native to tropical and southern Africa and tropical Asia. Coffee ranks as one of the world's most valuable and widely traded commodity crops and is an important export product of several countries, including those in Central and South America, the Caribbean and Africa.
Document 6: Echinopsis: Echinopsis is a large genus of cacti native to South America, sometimes known as hedgehog cactus, sea-urchin cactus or Easter lily cactus. One small species, "E. chamaecereus", is known as the peanut cactus. The 128 species range from large and treelike types to small globose cacti. The name derives from "echinos" hedgehog or sea urchin, and "opsis" appearance, a reference to these plants' dense coverings of spines.
Document 7: Echinacea angustifolia: Echinacea angustifolia (narrow-leaved purple coneflower or blacksamson echinacea) is a North American plant species in sunflower family. It is widespread across much of the Great Plains of central Canada and the central United States, with additional populations in nearby regions.
Document 8: Echinacea: Echinacea is a genus, or group of herbaceous flowering plants in the daisy family. The "Echinacea" genus has nine species, which are commonly called purple coneflowers. They are found only in eastern and central North America, where they are found growing in moist to dry prairies and open wooded areas. They have large, showy heads of composite flowers, blooming from early to late summer. The generic name is derived from the Greek word ἐχῖνος ("ekhinos"), meaning "hedgehog," due to the spiny central disk. These flowering plants and their parts have different uses. Some species are cultivated in gardens for their showy flowers. "Echinacea purpurea" is used in folk medicine. Two of the species, "E. tennesseensis" and "E. laevigata", are listed in the United States as endangered species.
Document 9: Coffee: Coffee is a brewed drink prepared from roasted coffee beans, which are the seeds of berries from the "Coffea" plant. The genus Coffea is native to tropical Africa (specifically having its origin in Ethiopia and Sudan) and Madagascar, the Comoros, Mauritius, and Réunion in the Indian Ocean. The plant was exported from Africa to countries around the world and coffee plants are now cultivated in over 70 countries, primarily in the equatorial regions of the Americas, Southeast Asia, India, and Africa. The two most commonly grown are the highly regarded arabica, and the less sophisticated but stronger and more hardy robusta. Once ripe, coffee berries are picked, processed, and dried. Dried coffee seeds (referred to as beans) are roasted to varying degrees, depending on the desired flavor. Roasted beans are ground and brewed with near-boiling water to produce coffee as a beverage.
Document 10: Centaurea: Centaurea ( ) is a genus of between 350 and 600 species of herbaceous thistle-like flowering plants in the family Asteraceae. Members of the genus are found only north of the equator, mostly in the Eastern Hemisphere; the Middle East and surrounding regions are particularly species-rich. Common names for this genus are centaury, centory, starthistles, knapweeds, centaureas and the more ambiguous "bluets"; a vernacular name used for these plants in parts of England is "loggerheads" (common knapweed). The "Plectocephalus" group – possibly a distinct genus – is known as basketflowers. "Cornflowers" is used for a few species, but that term more often specifically means "C. cyanus" (sometimes also called "basket flower"). The common name "centaury" is sometimes used, although this also refers to the unrelated plant genus "Centaurium".
Document 11: Eurybia paludosa: Eurybia paludosa, commonly known as the southern swamp aster, is an herbaceous perennial in the aster family. It is native to the southeastern United States where it is confined to the Carolinas and the states of Georgia and Florida. It is generally confined to moist soils, though it can occasionally be found on sand hills along the coastal plain. The southern swamp aster is often confused with the closely related southern prairie aster ("Eurybia hemispherica"), though they do not occur in the same habitats or geographical areas. Its flower heads emerge in the late summer through fall and show deep lavender to purple rays with yellow centres.
Document 12: 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 13: Penicillium coffeae: Penicillium coffeae is a fungus species of the genus of "Penicillium" which was isolated from the plant Coffea arabica L. in Hawaii. Insects play a role in spreading "Penicillium coffeae".
Document 14: Oromia Coffee Farmers Cooperative Union: The Oromia Coffee Farmers Cooperative Union (OCFCU) is an Ethiopian agricultural cooperative federation, established in June 1999, representing approximately 102,950 coffee growers, processors, and exporters of the Oromia Region of southern and western Ethiopia. OCFCU started with 34 cooperatives and $90,000 USD in capital. Its first exports amounted to 72 metric tons and $130,000. Today, its exports have grown to 7,000 metric tons and sales exceeding $40 million. In 2014 OCFCU represented 240 cooperatives with 250,000 members. They grow coffee of the "arabica" species exclusively, and produce both conventionally grown and organically grown beans. The union has chosen to bypass many of the middlemen that characterize the international coffee trade, sorting, roasting, and exporting its own coffee rather than simply growing and picking it the way most other Ethiopian coffee farmers do. The union returns 70 percent of its gross profits to its cooperatives.
Document 15: Coffee cherry tea: Coffee cherry tea is a herbal tea made from the dried skins of dried berries (or "cherries") of the coffee plant. It is also known as "cascara", from the Spanish cáscara, meaning "husk". It is different from cascara sagrada tea, a powerful plant-based laxative.
ground_truth: Coffea