Question: Which genus of plant is part of the daisy family, Zinnia or Pachypodium?

full_context: Document 1: Lithops: Lithops is a genus of succulent plants in the ice plant family, Aizoaceae. Members of the genus are native to southern Africa. The name is derived from the Ancient Greek words λίθος ("lithos"), meaning "stone," and ὄψ ("ops"), meaning "face," referring to the stone-like appearance of the plants. They avoid being eaten by blending in with surrounding rocks and are often known as pebble plants or living stones. The formation of the name from the Greek "-ops" means that even a single plant is called a Lithops.
Document 2: Euphorbia trigona: Euphorbia trigona (also known as African milk tree, cathedral cactus, Abyssinian euphorbia, and high chaparall ) is a perennial plant that originally comes from Central Africa. It has an upright stem that is branched into three or four sides. The stem itself is dark green with V-shaped light green patterns. The about 5mm long thorns are placed in pairs of two on the stem's ridges. The drop shaped leaves grow from between the two thorns on each ridge. The plant has never been known to flower, and is possibly a hybrid. As with many other "Euphorbia" species, the latex from the plant is poisonous and can cause skin irritations. The trigona can withstand brief cold temperatures of up to -3 degrees. It prefers sandy soil but can withstand most types of soil, provided it is well draining. It can root very easily from stem cuttings, if allowed to dry for 3-7 days before planting so that it can form a callus and not rot. It grows from 1.5 - 3 meters. It is a pest-free plant. A problem that some trigonas face is that they are susceptible to falling over when fully grown because of their shallow and small root system
Document 3: Helianthus: Helianthus or sunflower (from the Greek: ήλιος , "Hēlios", "sun" and ανθός , "anthos", "flower") L. is a genus of plants comprising about 70 species in the family Asteraceae. The genus is one of many in the Asteraceae that are known as sunflowers. Except for three species in South America, all "Helianthus" species are native to North America. The common name, "sunflower", typically refers to the popular annual species "Helianthus annuus", or the common sunflower, whose round flower heads in combination with the ligules look like the sun. This and other species, notably Jerusalem artichoke ("H. tuberosus"), are cultivated in temperate regions and some tropical regions as food crops for humans, cattle, poultry and ornamental plants. The largest sunflower field is located in Tuscany, Italy.
Document 4: Zinnia elegans: Zinnia elegans, known as youth-and-age, common zinnia or elegant zinnia, an annual flowering plant of the genus "Zinnia", is one of the best known zinnias. It is native to Mexico but grown as an ornamental in many places and naturalised in several places including scattered locations in South and Central America, the West Indies, the United States, Australia, and Italy.
Document 5: Pachyphytum: Pachyphytum is a small genus of succulents in the Crassulaceae family, native from Mexico, lands at 600 to high. The name comes from the ancient Greek "pachys" (=thick) and "phyton" (=plant) because of the shape of the leaves.
Document 6: Tigridia: Tigridia , the peacock flowers, tiger-flowers or shell flowers, is a genus of bulbous or cormous plants, belonging to the family Iridaceae. They have large showy flowers and one species, "Tigridia pavonia", is often cultivated for this. The approximately thirty five species in this family grow in the Western Hemisphere, from Mexico to Chile. The tigridia flower is short lived, each often blooming for only one day, but often several flowers will bloom from the same stalk. Usually they are dormant during the winter dry-season. Its roots are edible and were eaten by the Aztecs of Mexico who called it "cacomitl" and its flower "ocēlōxōchitl" "Jaguar flower". The genus name means "tiger-like" and alludes to the coloration and spotting of the flowers of the type species "Tigridia pavonia".
Document 7: Zinnia: Zinnia is a genus of plants of the sunflower tribe within the daisy family. They are native to scrub and dry grassland in an area stretching from the Southwestern United States to South America, with a centre of diversity in Mexico. Members of the genus are notable for their solitary long-stemmed flowers that come in a variety of bright colors. The genus name honors German master botanist Johann Gottfried Zinn (1727–59).
Document 8: Euphorbia bulbispina: Euphorbia bulbispina is a spiny plant of the Euphorbiaceae family. It was described by Rauh & Razafindratsira. in Euphorbia Journal 7: 31. 1991. It is endemic to a very small area in northern Madagascar where it is found in rock cracks in the Antsiranana district)
Document 9: Pachypodium: Pachypodium is a genus of succulent spine-bearing trees and shrubs, native to Madagascar and Africa. It belongs to the dogbane family, Apocynaceae. "Pachypodium" comes from a Latin form from Greek "pachus" (thick) and "podion" (foot) (or Gk podos, root form of pous, foot), hence meaning "thick-footed".
Document 10: Euphorbia pachypodioides: Euphorbia pachypodioides is a species of plant in the Euphorbiaceae family. It is endemic to Madagascar. Its natural habitat is rocky areas. It is threatened by habitat loss. It also has the binomial synonym "Euphorbia antankara" (Leandri, 1946).
Document 11: 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 12: Hoodia: Hoodia (known locally as "ghaap" or "bobbejaanghaap") is a genus of flowering plants in the family Apocynaceae, under the subfamily Asclepiadoideae, native to Southern Africa.
Document 13: Helianthus schweinitzii: Helianthus schweinitzii, known by the common name Schweinitz's sunflower, is a perennial wildflower endemic to the Piedmont physiographic province of North Carolina and South Carolina. It is classified in the Sunflower Family (Asteraceae). Nationwide it is one of the rarest species of sunflower in the United States, but within its range it is not uncommon along utility and highway rights-of-way in North Carolina and South Carolina. There are only about 90 known populations, many containing less than 40 plants each. It was listed as a federal endangered species on May 7, 1991.
Document 14: Gaillardia aristata: Gaillardia aristata is a North American species of flowering plants in the sunflower family known by the common names common blanketflower and common gaillardia. This perennial wildflower is widespread across much of North America, from Yukon east to Québec and south as far as California, Arizona, Illinois, and Connecticut, although it may be naturalized rather than native in parts of that range. It is also naturalized in scattered locations in Europe, Australia, and South America.
Document 15: 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.
ground_truth: Zinnia